400377665125 has 16 divisors (see below), whose sum is σ = 499741914672. Its totient is φ = 320256883200.

The previous prime is 400377665117. The next prime is 400377665159. The reversal of 400377665125 is 521566773004.

It can be written as a sum of positive squares in 8 ways, for example, as 306757576449 + 93620088676 = 553857^2 + 305974^2 .

It is not a de Polignac number, because 400377665125 - 2³ = 400377665117 is a prime.

It is a Duffinian number.

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, 676477 + ... + 1121773.

It is an arithmetic number, because the mean of its divisors is an integer number (31233869667).

Almost surely, 2^400377665125 is an apocalyptic number.

It is an amenable number.

400377665125 is a deficient number, since it is larger than the sum of its proper divisors (99364249547).

400377665125 is an equidigital number, since it uses as much as digits as its factorization.

400377665125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452505 (or 452495 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 400377665125 in words is "four hundred billion, three hundred seventy-seven million, six hundred sixty-five thousand, one hundred twenty-five".