638633206632 has 64 divisors (see below), whose sum is σ = 1670672407680. Its totient is φ = 203216262912.

The previous prime is 638633206597. The next prime is 638633206681. The reversal of 638633206632 is 236602336836.

It is a super-4 number, since 4×638633206632⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6737668 + ... + 6831795.

It is an arithmetic number, because the mean of its divisors is an integer number (26104256370).

Almost surely, 2^638633206632 is an apocalyptic number.

It is an amenable number.

638633206632 is an abundant number, since it is smaller than the sum of its proper divisors (1032039201048).

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

638633206632 is a wasteful number, since it uses less digits than its factorization.

638633206632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13569562 (or 13569558 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 48.

The spelling of 638633206632 in words is "six hundred thirty-eight billion, six hundred thirty-three million, two hundred six thousand, six hundred thirty-two".