161611100151156 has 18 divisors (see below), whose sum is σ = 408516947604402. Its totient is φ = 53870366717040.

The previous prime is 161611100151121. The next prime is 161611100151167. The reversal of 161611100151156 is 651151001116161.

161611100151156 is a `hidden beast` number, since 1 + 6 + 1 + 611 + 10 + 0 + 15 + 1 + 15 + 6 = 666.

161611100151156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 120957851671056 + 40653248480100 = 10998084^2 + 6375990^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×161611100151156² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4489197226421 = 161611100151156 / (1 + 6 + 1 + 6 + 1 + 1 + 1 + 0 + 0 + 1 + 5 + 1 + 1 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 161611100151156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2244598613175 + ... + 2244598613246.

Almost surely, 2^{161611100151156} is an apocalyptic number.

It is an amenable number.

161611100151156 is an abundant number, since it is smaller than the sum of its proper divisors (246905847453246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161611100151156 is a wasteful number, since it uses less digits than its factorization.

161611100151156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4489197226431 (or 4489197226426 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 36.

The spelling of 161611100151156 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred million, one hundred fifty-one thousand, one hundred fifty-six".