161555205635204 has 12 divisors (see below), whose sum is σ = 282723809372928. Its totient is φ = 80776974385800.

The previous prime is 161555205635177. The next prime is 161555205635237. The reversal of 161555205635204 is 402536502555161.

It is a super-2 number, since 2×161555205635204² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156529292 + ... + 157558019.

It is an arithmetic number, because the mean of its divisors is an integer number (23560317447744).

Almost surely, 2^{161555205635204} is an apocalyptic number.

It is an amenable number.

161555205635204 is a deficient number, since it is larger than the sum of its proper divisors (121168603737724).

161555205635204 is a wasteful number, since it uses less digits than its factorization.

161555205635204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314215906 (or 314215904 counting only the distinct ones).

The product of its (nonzero) digits is 5400000, while the sum is 50.

The spelling of 161555205635204 in words is "one hundred sixty-one trillion, five hundred fifty-five billion, two hundred five million, six hundred thirty-five thousand, two hundred four".