125515415121 has 16 divisors (see below), whose sum is σ = 177352000704. Its totient is φ = 78686429184.

The previous prime is 125515415099. The next prime is 125515415131. The reversal of 125515415121 is 121514515521.

It is a happy number.

It is not a de Polignac number, because 125515415121 - 2²⁵ = 125481860689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (125515415131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1008451 + ... + 1126056.

It is an arithmetic number, because the mean of its divisors is an integer number (11084500044).

Almost surely, 2^125515415121 is an apocalyptic number.

It is an amenable number.

125515415121 is a deficient number, since it is larger than the sum of its proper divisors (51836585583).

125515415121 is a wasteful number, since it uses less digits than its factorization.

125515415121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135680.

The product of its digits is 10000, while the sum is 33.

The spelling of 125515415121 in words is "one hundred twenty-five billion, five hundred fifteen million, four hundred fifteen thousand, one hundred twenty-one".