138195657625 has 8 divisors (see below), whose sum is σ = 172468180872. Its totient is φ = 110556526000.

The previous prime is 138195657617. The next prime is 138195657647. The reversal of 138195657625 is 526756591831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23258385049 + 114937272576 = 152507^2 + 339024^2 .

It is not a de Polignac number, because 138195657625 - 2³ = 138195657617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138195657625.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552782506 + ... + 552782755.

It is an arithmetic number, because the mean of its divisors is an integer number (21558522609).

Almost surely, 2^138195657625 is an apocalyptic number.

It is an amenable number.

138195657625 is a deficient number, since it is larger than the sum of its proper divisors (34272523247).

138195657625 is an equidigital number, since it uses as much as digits as its factorization.

138195657625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105565276 (or 1105565266 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 58.

The spelling of 138195657625 in words is "one hundred thirty-eight billion, one hundred ninety-five million, six hundred fifty-seven thousand, six hundred twenty-five".