638829061275 has 24 divisors (see below), whose sum is σ = 1118326641264. Its totient is φ = 320667136000.

The previous prime is 638829061231. The next prime is 638829061279. The reversal of 638829061275 is 572160928836.

It is not a de Polignac number, because 638829061275 - 2¹⁰ = 638829060251 is a prime.

It is a super-3 number, since 3×638829061275³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (638829061279) 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, 250519926 + ... + 250522475.

It is an arithmetic number, because the mean of its divisors is an integer number (46596943386).

Almost surely, 2^638829061275 is an apocalyptic number.

638829061275 is a deficient number, since it is larger than the sum of its proper divisors (479497579989).

638829061275 is a wasteful number, since it uses less digits than its factorization.

638829061275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501042431 (or 501042426 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 638829061275 in words is "six hundred thirty-eight billion, eight hundred twenty-nine million, sixty-one thousand, two hundred seventy-five".