638353651332 has 36 divisors (see below), whose sum is σ = 1526707045808. Its totient is φ = 207594676800.

The previous prime is 638353651297. The next prime is 638353651349. The reversal of 638353651332 is 233156353836.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15802594 + ... + 15842937.

Almost surely, 2^638353651332 is an apocalyptic number.

It is an amenable number.

638353651332 is an abundant number, since it is smaller than the sum of its proper divisors (888353394476).

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

638353651332 is a wasteful number, since it uses less digits than its factorization.

638353651332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31645620 (or 31645577 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 48.

The spelling of 638353651332 in words is "six hundred thirty-eight billion, three hundred fifty-three million, six hundred fifty-one thousand, three hundred thirty-two".