638606055231 has 24 divisors (see below), whose sum is σ = 925060571136. Its totient is φ = 424524980880.

The previous prime is 638606055167. The next prime is 638606055301. The reversal of 638606055231 is 132550606836.

638606055231 is a `hidden beast` number, since 6 + 3 + 8 + 6 + 0 + 60 + 552 + 31 = 666.

It is not a de Polignac number, because 638606055231 - 2⁶ = 638606055167 is a prime.

It is a super-2 number, since 2×638606055231² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638606054231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6077566 + ... + 6181748.

It is an arithmetic number, because the mean of its divisors is an integer number (38544190464).

Almost surely, 2^638606055231 is an apocalyptic number.

638606055231 is a deficient number, since it is larger than the sum of its proper divisors (286454515905).

638606055231 is a wasteful number, since it uses less digits than its factorization.

638606055231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106123 (or 106120 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 638606055231 in words is "six hundred thirty-eight billion, six hundred six million, fifty-five thousand, two hundred thirty-one".