638432549123560 has 32 divisors (see below), whose sum is σ = 1443691694016000. Its totient is φ = 254089738140480.

The previous prime is 638432549123519. The next prime is 638432549123599. The reversal of 638432549123560 is 65321945234836.

It is a super-2 number, since 2×638432549123560² (a number of 30 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40102539096 + ... + 40102555015.

It is an arithmetic number, because the mean of its divisors is an integer number (45115365438000).

Almost surely, 2^{638432549123560} is an apocalyptic number.

It is an amenable number.

638432549123560 is an abundant number, since it is smaller than the sum of its proper divisors (805259144892440).

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

638432549123560 is a wasteful number, since it uses less digits than its factorization.

638432549123560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80205094321 (or 80205094317 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 61.

The spelling of 638432549123560 in words is "six hundred thirty-eight trillion, four hundred thirty-two billion, five hundred forty-nine million, one hundred twenty-three thousand, five hundred sixty".