400013663424985 has 16 divisors (see below), whose sum is σ = 484427461470480. Its totient is φ = 317070308321280.

The previous prime is 400013663424959. The next prime is 400013663425067. The reversal of 400013663424985 is 589424366310004.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 115203385424656 + 284810278000329 = 10733284^2 + 16876323^2 .

It is not a de Polignac number, because 400013663424985 - 2¹⁹ = 400013662900697 is a prime.

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, 31208625 + ... + 42118945.

It is an arithmetic number, because the mean of its divisors is an integer number (30276716341905).

Almost surely, 2^{400013663424985} is an apocalyptic number.

It is an amenable number.

400013663424985 is a deficient number, since it is larger than the sum of its proper divisors (84413798045495).

400013663424985 is a wasteful number, since it uses less digits than its factorization.

400013663424985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10977708.

The product of its (nonzero) digits is 14929920, while the sum is 55.

The spelling of 400013663424985 in words is "four hundred trillion, thirteen billion, six hundred sixty-three million, four hundred twenty-four thousand, nine hundred eighty-five".