163664433052778 has 32 divisors (see below), whose sum is σ = 281662057067904. Its totient is φ = 69868290834432.

The previous prime is 163664433052733. The next prime is 163664433052787. The reversal of 163664433052778 is 877250334466361.

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 15 ways as a sum of consecutive naturals, for example, 572777501 + ... + 573063167.

It is an arithmetic number, because the mean of its divisors is an integer number (8801939283372).

Almost surely, 2^{163664433052778} is an apocalyptic number.

163664433052778 is a deficient number, since it is larger than the sum of its proper divisors (117997624015126).

163664433052778 is a wasteful number, since it uses less digits than its factorization.

163664433052778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445166.

The product of its (nonzero) digits is 365783040, while the sum is 65.

The spelling of 163664433052778 in words is "one hundred sixty-three trillion, six hundred sixty-four billion, four hundred thirty-three million, fifty-two thousand, seven hundred seventy-eight".