400376863665 has 12 divisors (see below), whose sum is σ = 693986563764. Its totient is φ = 213534327264.

The previous prime is 400376863613. The next prime is 400376863673. The reversal of 400376863665 is 566368673004.

400376863665 is a `hidden beast` number, since 400 + 3 + 76 + 86 + 36 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46931156496 + 353445707169 = 216636^2 + 594513^2 .

It is not a de Polignac number, because 400376863665 - 2²⁰ = 400375815089 is a prime.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 4448631774 + ... + 4448631863.

It is an arithmetic number, because the mean of its divisors is an integer number (57832213647).

Almost surely, 2^400376863665 is an apocalyptic number.

400376863665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400376863665 is a deficient number, since it is larger than the sum of its proper divisors (293609700099).

400376863665 is a wasteful number, since it uses less digits than its factorization.

400376863665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8897263648 (or 8897263645 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 54.

The spelling of 400376863665 in words is "four hundred billion, three hundred seventy-six million, eight hundred sixty-three thousand, six hundred sixty-five".