125675156521 has 4 divisors (see below), whose sum is σ = 125799711700. Its totient is φ = 125550601344.

The previous prime is 125675156507. The next prime is 125675156527. The reversal of 125675156521 is 125651576521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125651576521 = 317 ⋅396377213.

It can be written as a sum of positive squares in 2 ways, for example, as 88911312400 + 36763844121 = 298180^2 + 191739^2 .

It is a cyclic number.

It is not a de Polignac number, because 125675156521 - 2⁵ = 125675156489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125675156527) 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, 62276076 + ... + 62278093.

It is an arithmetic number, because the mean of its divisors is an integer number (31449927925).

Almost surely, 2^125675156521 is an apocalyptic number.

It is an amenable number.

125675156521 is a deficient number, since it is larger than the sum of its proper divisors (124555179).

125675156521 is a wasteful number, since it uses less digits than its factorization.

125675156521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124555178.

The product of its digits is 630000, while the sum is 46.

The spelling of 125675156521 in words is "one hundred twenty-five billion, six hundred seventy-five million, one hundred fifty-six thousand, five hundred twenty-one".