400440256065 has 40 divisors (see below), whose sum is σ = 740981945088. Its totient is φ = 206678835360.

The previous prime is 400440256061. The next prime is 400440256067. The reversal of 400440256065 is 560652044004.

400440256065 is a `hidden beast` number, since 4 + 0 + 0 + 4 + 40 + 2 + 5 + 606 + 5 = 666.

It is not a de Polignac number, because 400440256065 - 2² = 400440256061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400440256061) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15934887 + ... + 15959996.

Almost surely, 2^400440256065 is an apocalyptic number.

400440256065 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400440256065 is a deficient number, since it is larger than the sum of its proper divisors (340541689023).

400440256065 is a wasteful number, since it uses less digits than its factorization.

400440256065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31894931 (or 31894922 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 400440256065 in words is "four hundred billion, four hundred forty million, two hundred fifty-six thousand, sixty-five".