401985320868 has 18 divisors (see below), whose sum is σ = 1016129561174. Its totient is φ = 133995106944.

The previous prime is 401985320833. The next prime is 401985320887. The reversal of 401985320868 is 868023589104.

401985320868 is a `hidden beast` number, since 40 + 1 + 9 + 8 + 532 + 0 + 8 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 380390430564 + 21594890304 = 616758^2 + 146952^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5583129421 + ... + 5583129492.

Almost surely, 2^401985320868 is an apocalyptic number.

It is an amenable number.

401985320868 is an abundant number, since it is smaller than the sum of its proper divisors (614144240306).

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

401985320868 is a wasteful number, since it uses less digits than its factorization.

401985320868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11166258923 (or 11166258918 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 401985320868 in words is "four hundred one billion, nine hundred eighty-five million, three hundred twenty thousand, eight hundred sixty-eight".