638863625358 has 64 divisors (see below), whose sum is σ = 1622626560000. Its totient is φ = 182519440992.

The previous prime is 638863625357. The next prime is 638863625429. The reversal of 638863625358 is 853526368836.

638863625358 is a `hidden beast` number, since 6 + 38 + 8 + 6 + 3 + 62 + 535 + 8 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 638863625295 and 638863625304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638863625357) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6067243 + ... + 6171641.

It is an arithmetic number, because the mean of its divisors is an integer number (25353540000).

Almost surely, 2^638863625358 is an apocalyptic number.

638863625358 is an abundant number, since it is smaller than the sum of its proper divisors (983762934642).

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

638863625358 is a wasteful number, since it uses less digits than its factorization.

638863625358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120606 (or 120600 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 63.

The spelling of 638863625358 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, six hundred twenty-five thousand, three hundred fifty-eight".