638861714624 has 168 divisors, whose sum is σ = 1561817145600. Its totient is φ = 257982810624.

The previous prime is 638861714593. The next prime is 638861714653. The reversal of 638861714624 is 426417168836.

It is a super-2 number, since 2×638861714624² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a self number, because there is not a number n which added to its sum of digits gives 638861714624.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4766477 + ... + 4898675.

Almost surely, 2^638861714624 is an apocalyptic number.

638861714624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638861714624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (780908572800).

638861714624 is an abundant number, since it is smaller than the sum of its proper divisors (922955430976).

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

638861714624 is a wasteful number, since it uses less digits than its factorization.

638861714624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132315 (or 132298 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 56.

The spelling of 638861714624 in words is "six hundred thirty-eight billion, eight hundred sixty-one million, seven hundred fourteen thousand, six hundred twenty-four".