163664554440 has 64 divisors (see below), whose sum is σ = 491032071360. Its totient is φ = 43640467200.

The previous prime is 163664554411. The next prime is 163664554511. The reversal of 163664554440 is 44455466361.

It is a self number, because there is not a number n which added to its sum of digits gives 163664554440.

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, 1736202 + ... + 1828038.

It is an arithmetic number, because the mean of its divisors is an integer number (7672376115).

Almost surely, 2^163664554440 is an apocalyptic number.

163664554440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163664554440 is an abundant number, since it is smaller than the sum of its proper divisors (327367516920).

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

163664554440 is a wasteful number, since it uses less digits than its factorization.

163664554440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106702 (or 106698 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 163664554440 in words is "one hundred sixty-three billion, six hundred sixty-four million, five hundred fifty-four thousand, four hundred forty".