638611725468 has 48 divisors (see below), whose sum is σ = 1565956810880. Its totient is φ = 202300628544.

The previous prime is 638611725457. The next prime is 638611725469. The reversal of 638611725468 is 864527116836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638611725469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16705498 + ... + 16743681.

Almost surely, 2^638611725468 is an apocalyptic number.

It is an amenable number.

638611725468 is an abundant number, since it is smaller than the sum of its proper divisors (927345085412).

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

638611725468 is a wasteful number, since it uses less digits than its factorization.

638611725468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33449266 (or 33449264 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The spelling of 638611725468 in words is "six hundred thirty-eight billion, six hundred eleven million, seven hundred twenty-five thousand, four hundred sixty-eight".