638890669612 has 24 divisors (see below), whose sum is σ = 1222034284016. Its totient is φ = 290471531328.

The previous prime is 638890669591. The next prime is 638890669657. The reversal of 638890669612 is 216966098836.

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, 91685763 + ... + 91692730.

Almost surely, 2^638890669612 is an apocalyptic number.

It is an amenable number.

638890669612 is a deficient number, since it is larger than the sum of its proper divisors (583143614404).

638890669612 is a wasteful number, since it uses less digits than its factorization.

638890669612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183378577 (or 183378575 counting only the distinct ones).

The product of its (nonzero) digits is 40310784, while the sum is 64.

The spelling of 638890669612 in words is "six hundred thirty-eight billion, eight hundred ninety million, six hundred sixty-nine thousand, six hundred twelve".