638655530274 has 12 divisors (see below), whose sum is σ = 1383753648966. Its totient is φ = 212885176752.

The previous prime is 638655530267. The next prime is 638655530329. The reversal of 638655530274 is 472035556836.

638655530274 is a `hidden beast` number, since 6 + 3 + 8 + 65 + 553 + 0 + 27 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 633719484225 + 4936046049 = 796065^2 + 70257^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 638655530274.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17740431379 + ... + 17740431414.

Almost surely, 2^638655530274 is an apocalyptic number.

638655530274 is an abundant number, since it is smaller than the sum of its proper divisors (745098118692).

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

638655530274 is a wasteful number, since it uses less digits than its factorization.

638655530274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35480862801 (or 35480862798 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 54.

The spelling of 638655530274 in words is "six hundred thirty-eight billion, six hundred fifty-five million, five hundred thirty thousand, two hundred seventy-four".