638132626250 has 40 divisors (see below), whose sum is σ = 1366989498336. Its totient is φ = 218788326000.

The previous prime is 638132626231. The next prime is 638132626259. The reversal of 638132626250 is 52626231836.

It is not an unprimeable number, because it can be changed into a prime (638132626259) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36455972 + ... + 36473471.

Almost surely, 2^638132626250 is an apocalyptic number.

638132626250 is an abundant number, since it is smaller than the sum of its proper divisors (728856872086).

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

638132626250 is an equidigital number, since it uses as much as digits as its factorization.

638132626250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72929472 (or 72929457 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 638132626250 in words is "six hundred thirty-eight billion, one hundred thirty-two million, six hundred twenty-six thousand, two hundred fifty".