125116511521 has 4 divisors (see below), whose sum is σ = 130556359872. Its totient is φ = 119676663172.

The previous prime is 125116511497. The next prime is 125116511537. The reversal of 125116511521 is 125115611521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125115611521 = 41 ⋅3051600281.

It is a cyclic number.

It is not a de Polignac number, because 125116511521 - 2¹⁷ = 125116380449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125116511561) 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, 2719924141 + ... + 2719924186.

It is an arithmetic number, because the mean of its divisors is an integer number (32639089968).

Almost surely, 2^125116511521 is an apocalyptic number.

It is an amenable number.

125116511521 is a deficient number, since it is larger than the sum of its proper divisors (5439848351).

125116511521 is an equidigital number, since it uses as much as digits as its factorization.

125116511521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439848350.

The product of its digits is 3000, while the sum is 31.

The spelling of 125116511521 in words is "one hundred twenty-five billion, one hundred sixteen million, five hundred eleven thousand, five hundred twenty-one".