53685125138 has 18 divisors (see below), whose sum is σ = 84998912679. Its totient is φ = 25426847052.

The previous prime is 53685125107. The next prime is 53685125227. The reversal of 53685125138 is 83152158635.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26842562569 + 26842562569 = 163837^2 + 163837^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=163837.

It is a super-2 number, since 2×53685125138² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53685125092 and 53685125101.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6221495 + ... + 6230117.

Almost surely, 2^53685125138 is an apocalyptic number.

53685125138 is a deficient number, since it is larger than the sum of its proper divisors (31313787541).

53685125138 is an frugal number, since it uses more digits than its factorization.

53685125138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17286 (or 8644 counting only the distinct ones).

The product of its digits is 864000, while the sum is 47.

The spelling of 53685125138 in words is "fifty-three billion, six hundred eighty-five million, one hundred twenty-five thousand, one hundred thirty-eight".