161011621116 has 18 divisors (see below), whose sum is σ = 407001597912. Its totient is φ = 53670540360.

The previous prime is 161011621109. The next prime is 161011621159. The reversal of 161011621116 is 611126110161.

161011621116 is a `hidden beast` number, since 1 + 6 + 10 + 11 + 621 + 1 + 16 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 161011621116.

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, 2236272480 + ... + 2236272551.

It is an arithmetic number, because the mean of its divisors is an integer number (22611199884).

Almost surely, 2^161011621116 is an apocalyptic number.

It is an amenable number.

161011621116 is an abundant number, since it is smaller than the sum of its proper divisors (245989976796).

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

161011621116 is a wasteful number, since it uses less digits than its factorization.

161011621116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4472545041 (or 4472545036 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

Adding to 161011621116 its reverse (611126110161), we get a palindrome (772137731277).

The spelling of 161011621116 in words is "one hundred sixty-one billion, eleven million, six hundred twenty-one thousand, one hundred sixteen".