185905139864 has 32 divisors (see below), whose sum is σ = 372598863840. Its totient is φ = 86742585600.

The previous prime is 185905139851. The next prime is 185905139879. The reversal of 185905139864 is 468931509581.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 12313847 + ... + 12328934.

It is an arithmetic number, because the mean of its divisors is an integer number (11643714495).

Almost surely, 2^185905139864 is an apocalyptic number.

It is an amenable number.

185905139864 is an abundant number, since it is smaller than the sum of its proper divisors (186693723976).

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

185905139864 is a wasteful number, since it uses less digits than its factorization.

185905139864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24642851 (or 24642847 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 59.

The spelling of 185905139864 in words is "one hundred eighty-five billion, nine hundred five million, one hundred thirty-nine thousand, eight hundred sixty-four".