125137904165 has 4 divisors (see below), whose sum is σ = 150165485004. Its totient is φ = 100110323328.

The previous prime is 125137904159. The next prime is 125137904167. The reversal of 125137904165 is 561409731521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561409731521 = 41 ⋅13692920281.

It can be written as a sum of positive squares in 2 ways, for example, as 47086396036 + 78051508129 = 216994^2 + 279377^2 .

It is a cyclic number.

It is not a de Polignac number, because 125137904165 - 2⁴ = 125137904149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125137904167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12513790412 + ... + 12513790421.

It is an arithmetic number, because the mean of its divisors is an integer number (37541371251).

Almost surely, 2^125137904165 is an apocalyptic number.

It is an amenable number.

125137904165 is a deficient number, since it is larger than the sum of its proper divisors (25027580839).

125137904165 is an equidigital number, since it uses as much as digits as its factorization.

125137904165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25027580838.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 125137904165 in words is "one hundred twenty-five billion, one hundred thirty-seven million, nine hundred four thousand, one hundred sixty-five".