161904892618 has 32 divisors (see below), whose sum is σ = 283392432000. Its totient is φ = 69344476992.

The previous prime is 161904892607. The next prime is 161904892627. The reversal of 161904892618 is 816298409161.

It is a super-2 number, since 2×161904892618² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1037746 + ... + 1183522.

It is an arithmetic number, because the mean of its divisors is an integer number (8856013500).

Almost surely, 2^161904892618 is an apocalyptic number.

161904892618 is a deficient number, since it is larger than the sum of its proper divisors (121487539382).

161904892618 is a wasteful number, since it uses less digits than its factorization.

161904892618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147419 (or 147405 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 161904892618 in words is "one hundred sixty-one billion, nine hundred four million, eight hundred ninety-two thousand, six hundred eighteen".