408686686868 has 6 divisors (see below), whose sum is σ = 715201702026. Its totient is φ = 204343343432.

The previous prime is 408686686853. The next prime is 408686686871. The reversal of 408686686868 is 868686686804.

It can be written as a sum of positive squares in only one way, i.e., 242485335184 + 166201351684 = 492428^2 + 407678^2 .

It is a junction number, because it is equal to n+sod(n) for n = 408686686795 and 408686686804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51085835855 + ... + 51085835862.

It is an arithmetic number, because the mean of its divisors is an integer number (119200283671).

Almost surely, 2^408686686868 is an apocalyptic number.

It is an amenable number.

408686686868 is a deficient number, since it is larger than the sum of its proper divisors (306515015158).

408686686868 is a wasteful number, since it uses less digits than its factorization.

408686686868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102171671721 (or 102171671719 counting only the distinct ones).

The product of its (nonzero) digits is 1019215872, while the sum is 74.

The spelling of 408686686868 in words is "four hundred eight billion, six hundred eighty-six million, six hundred eighty-six thousand, eight hundred sixty-eight".