637500138125 has 20 divisors (see below), whose sum is σ = 843480196812. Its totient is φ = 480000096000.

The previous prime is 637500138059. The next prime is 637500138167. The reversal of 637500138125 is 521831005736.

It can be written as a sum of positive squares in 10 ways, for example, as 588224573764 + 49275564361 = 766958^2 + 221981^2 .

It is not a de Polignac number, because 637500138125 - 2¹⁰ = 637500137101 is a prime.

It is a super-2 number, since 2×637500138125² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29989382 + ... + 30010631.

Almost surely, 2^637500138125 is an apocalyptic number.

It is an amenable number.

637500138125 is a deficient number, since it is larger than the sum of its proper divisors (205980058687).

637500138125 is an equidigital number, since it uses as much as digits as its factorization.

637500138125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60000050 (or 60000035 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 637500138125 in words is "six hundred thirty-seven billion, five hundred million, one hundred thirty-eight thousand, one hundred twenty-five".