161155552042 has 8 divisors (see below), whose sum is σ = 241744328100. Its totient is φ = 80574109344.

The previous prime is 161155551883. The next prime is 161155552043. The reversal of 161155552042 is 240255551161.

It can be written as a sum of positive squares in 2 ways, for example, as 122618328561 + 38537223481 = 350169^2 + 196309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161155552042² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161155551992 and 161155552010.

It is not an unprimeable number, because it can be changed into a prime (161155552043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1778067 + ... + 1866502.

Almost surely, 2^161155552042 is an apocalyptic number.

161155552042 is a deficient number, since it is larger than the sum of its proper divisors (80588776058).

161155552042 is a wasteful number, since it uses less digits than its factorization.

161155552042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666680.

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 161155552042 in words is "one hundred sixty-one billion, one hundred fifty-five million, five hundred fifty-two thousand, forty-two".