161639157084666 has 32 divisors (see below), whose sum is σ = 324661886304000. Its totient is φ = 53649559172160.

The previous prime is 161639157084659. The next prime is 161639157084851. The reversal of 161639157084666 is 666480751936161.

It is a super-2 number, since 2×161639157084666² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161639157084666.

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, 52952290 + ... + 55921581.

It is an arithmetic number, because the mean of its divisors is an integer number (10145683947000).

Almost surely, 2^{161639157084666} is an apocalyptic number.

161639157084666 is an abundant number, since it is smaller than the sum of its proper divisors (163022729219334).

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

161639157084666 is a wasteful number, since it uses less digits than its factorization.

161639157084666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108874934.

The product of its (nonzero) digits is 235146240, while the sum is 69.

The spelling of 161639157084666 in words is "one hundred sixty-one trillion, six hundred thirty-nine billion, one hundred fifty-seven million, eighty-four thousand, six hundred sixty-six".