125139001265 has 4 divisors (see below), whose sum is σ = 150166801524. Its totient is φ = 100111201008.

The previous prime is 125139001261. The next prime is 125139001369. The reversal of 125139001265 is 562100931521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562100931521 = 1511 ⋅372005911.

It can be written as a sum of positive squares in 2 ways, for example, as 35365059136 + 89773942129 = 188056^2 + 299623^2 .

It is a cyclic number.

It is not a de Polignac number, because 125139001265 - 2² = 125139001261 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125139001261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12513900122 + ... + 12513900131.

It is an arithmetic number, because the mean of its divisors is an integer number (37541700381).

Almost surely, 2^125139001265 is an apocalyptic number.

It is an amenable number.

125139001265 is a deficient number, since it is larger than the sum of its proper divisors (25027800259).

125139001265 is an equidigital number, since it uses as much as digits as its factorization.

125139001265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25027800258.

The product of its (nonzero) digits is 16200, while the sum is 35.

Adding to 125139001265 its reverse (562100931521), we get a palindrome (687239932786).

The spelling of 125139001265 in words is "one hundred twenty-five billion, one hundred thirty-nine million, one thousand, two hundred sixty-five".