638875126325 has 6 divisors (see below), whose sum is σ = 792205156674. Its totient is φ = 511100101040.

The previous prime is 638875126313. The next prime is 638875126339. The reversal of 638875126325 is 523621578836.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 75428228164 + 563446898161 = 274642^2 + 750631^2 .

It is not a de Polignac number, because 638875126325 - 2²⁰ = 638874077749 is a prime.

It is a super-2 number, since 2×638875126325² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12777502502 + ... + 12777502551.

It is an arithmetic number, because the mean of its divisors is an integer number (132034192779).

Almost surely, 2^638875126325 is an apocalyptic number.

It is an amenable number.

638875126325 is a deficient number, since it is larger than the sum of its proper divisors (153330030349).

638875126325 is a wasteful number, since it uses less digits than its factorization.

638875126325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25555005063 (or 25555005058 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 56.

The spelling of 638875126325 in words is "six hundred thirty-eight billion, eight hundred seventy-five million, one hundred twenty-six thousand, three hundred twenty-five".