639486669675 has 48 divisors (see below), whose sum is σ = 1208467549952. Its totient is φ = 292302345600.

The previous prime is 639486669649. The next prime is 639486669683. The reversal of 639486669675 is 576966684936.

It is not a de Polignac number, because 639486669675 - 2⁹ = 639486669163 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639486669597 and 639486669606.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4693005 + ... + 4827345.

Almost surely, 2^639486669675 is an apocalyptic number.

639486669675 is a deficient number, since it is larger than the sum of its proper divisors (568980880277).

639486669675 is a wasteful number, since it uses less digits than its factorization.

639486669675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143428 (or 143423 counting only the distinct ones).

The product of its digits is 2116316160, while the sum is 75.

The spelling of 639486669675 in words is "six hundred thirty-nine billion, four hundred eighty-six million, six hundred sixty-nine thousand, six hundred seventy-five".