400543265856 has 56 divisors (see below), whose sum is σ = 1069675178400. Its totient is φ = 132266616832.

The previous prime is 400543265839. The next prime is 400543265873. The reversal of 400543265856 is 658562345004.

It is an interprime number because it is at equal distance from previous prime (400543265839) and next prime (400543265873).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9727881 + ... + 9768968.

Almost surely, 2^400543265856 is an apocalyptic number.

It is an amenable number.

400543265856 is an abundant number, since it is smaller than the sum of its proper divisors (669131912544).

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

400543265856 is a wasteful number, since it uses less digits than its factorization.

400543265856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19496971 (or 19496961 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 400543265856 in words is "four hundred billion, five hundred forty-three million, two hundred sixty-five thousand, eight hundred fifty-six".