401556566940 has 48 divisors (see below), whose sum is σ = 1142790502560. Its totient is φ = 105326311680.

The previous prime is 401556566903. The next prime is 401556566953. The reversal of 401556566940 is 49665655104.

It is a super-2 number, since 2×401556566940² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

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, 54853795 + ... + 54861114.

It is an arithmetic number, because the mean of its divisors is an integer number (23808135470).

Almost surely, 2^401556566940 is an apocalyptic number.

It is an amenable number.

401556566940 is an abundant number, since it is smaller than the sum of its proper divisors (741233935620).

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

401556566940 is a wasteful number, since it uses less digits than its factorization.

401556566940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109714982 (or 109714980 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 51.

The spelling of 401556566940 in words is "four hundred one billion, five hundred fifty-six million, five hundred sixty-six thousand, nine hundred forty".