638881375012 has 12 divisors (see below), whose sum is σ = 1131512797296. Its totient is φ = 315592004360.

The previous prime is 638881375007. The next prime is 638881375019. The reversal of 638881375012 is 210573188836.

It is a happy number.

It is a super-2 number, since 2×638881375012² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638881375019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962170414 + ... + 962171077.

It is an arithmetic number, because the mean of its divisors is an integer number (94292733108).

Almost surely, 2^638881375012 is an apocalyptic number.

It is an amenable number.

638881375012 is a deficient number, since it is larger than the sum of its proper divisors (492631422284).

638881375012 is a wasteful number, since it uses less digits than its factorization.

638881375012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924341578 (or 1924341576 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 638881375012 in words is "six hundred thirty-eight billion, eight hundred eighty-one million, three hundred seventy-five thousand, twelve".