638405483586 has 16 divisors (see below), whose sum is σ = 1375027195584. Its totient is φ = 196432456464.

The previous prime is 638405483531. The next prime is 638405483603. The reversal of 638405483586 is 685384504836.

It is a super-2 number, since 2×638405483586² (a number of 24 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 4092342766 + ... + 4092342921.

It is an arithmetic number, because the mean of its divisors is an integer number (85939199724).

Almost surely, 2^638405483586 is an apocalyptic number.

638405483586 is an abundant number, since it is smaller than the sum of its proper divisors (736621711998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638405483586 is a wasteful number, since it uses less digits than its factorization.

638405483586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184685705.

The product of its (nonzero) digits is 66355200, while the sum is 60.

The spelling of 638405483586 in words is "six hundred thirty-eight billion, four hundred five million, four hundred eighty-three thousand, five hundred eighty-six".