161556006110565 has 64 divisors (see below), whose sum is σ = 283686537738240. Its totient is φ = 77858584362240.

The previous prime is 161556006110467. The next prime is 161556006110591. The reversal of 161556006110565 is 565011600655161.

It is not a de Polignac number, because 161556006110565 - 2⁹ = 161556006110053 is a prime.

It is a super-2 number, since 2×161556006110565² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1044450051 + ... + 1044604719.

It is an arithmetic number, because the mean of its divisors is an integer number (4432602152160).

Almost surely, 2^{161556006110565} is an apocalyptic number.

161556006110565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161556006110565 is a deficient number, since it is larger than the sum of its proper divisors (122130531627675).

161556006110565 is a wasteful number, since it uses less digits than its factorization.

161556006110565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192762.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 161556006110565 in words is "one hundred sixty-one trillion, five hundred fifty-six billion, six million, one hundred ten thousand, five hundred sixty-five".