161566616115606 has 48 divisors (see below), whose sum is σ = 353833145257680. Its totient is φ = 49154234088960.

The previous prime is 161566616115587. The next prime is 161566616115617. The reversal of 161566616115606 is 606511616665161.

It is a super-2 number, since 2×161566616115606² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 895055335 + ... + 895235826.

It is an arithmetic number, because the mean of its divisors is an integer number (7371523859535).

Almost surely, 2^{161566616115606} is an apocalyptic number.

161566616115606 is an abundant number, since it is smaller than the sum of its proper divisors (192266529142074).

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

161566616115606 is a wasteful number, since it uses less digits than its factorization.

161566616115606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790291281 (or 1790291268 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 57.

The spelling of 161566616115606 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, six hundred sixteen million, one hundred fifteen thousand, six hundred six".