400855868685 has 40 divisors (see below), whose sum is σ = 719743927320. Its totient is φ = 213440904576.

The previous prime is 400855868599. The next prime is 400855868771. The reversal of 400855868685 is 586868558004.

400855868685 is a `hidden beast` number, since 40 + 0 + 8 + 5 + 586 + 8 + 6 + 8 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (400855868599) and next prime (400855868771).

It can be written as a sum of positive squares in 4 ways, for example, as 70022685924 + 330833182761 = 264618^2 + 575181^2 .

It is not a de Polignac number, because 400855868685 - 2²⁶ = 400788759821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 559050 + ... + 1055579.

It is an arithmetic number, because the mean of its divisors is an integer number (17993598183).

Almost surely, 2^400855868685 is an apocalyptic number.

400855868685 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400855868685 is a deficient number, since it is larger than the sum of its proper divisors (318888058635).

400855868685 is a wasteful number, since it uses less digits than its factorization.

400855868685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615259 (or 1615250 counting only the distinct ones).

The product of its (nonzero) digits is 73728000, while the sum is 63.

The spelling of 400855868685 in words is "four hundred billion, eight hundred fifty-five million, eight hundred sixty-eight thousand, six hundred eighty-five".