161605611055015 has 16 divisors (see below), whose sum is σ = 194093316724320. Its totient is φ = 129173435896960.

The previous prime is 161605611054929. The next prime is 161605611055033. The reversal of 161605611055015 is 510550116506161.

It is not a de Polignac number, because 161605611055015 - 2²³ = 161605602666407 is a prime.

It is a super-2 number, since 2×161605611055015² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 829419276 + ... + 829614094.

It is an arithmetic number, because the mean of its divisors is an integer number (12130832295270).

Almost surely, 2^{161605611055015} is an apocalyptic number.

161605611055015 is a deficient number, since it is larger than the sum of its proper divisors (32487705669305).

161605611055015 is a wasteful number, since it uses less digits than its factorization.

161605611055015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336482.

The product of its (nonzero) digits is 135000, while the sum is 43.

The spelling of 161605611055015 in words is "one hundred sixty-one trillion, six hundred five billion, six hundred eleven million, fifty-five thousand, fifteen".