125515415213 has 4 divisors (see below), whose sum is σ = 126357800700. Its totient is φ = 124673029728.

The previous prime is 125515415209. The next prime is 125515415219. The reversal of 125515415213 is 312514515521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312514515521 = 13 ⋅24039578117.

It can be written as a sum of positive squares in 2 ways, for example, as 58950383209 + 66565032004 = 242797^2 + 258002^2 .

It is a cyclic number.

It is not a de Polignac number, because 125515415213 - 2² = 125515415209 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 (125515415219) 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, 421192520 + ... + 421192817.

It is an arithmetic number, because the mean of its divisors is an integer number (31589450175).

Almost surely, 2^125515415213 is an apocalyptic number.

It is an amenable number.

125515415213 is a deficient number, since it is larger than the sum of its proper divisors (842385487).

125515415213 is an equidigital number, since it uses as much as digits as its factorization.

125515415213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842385486.

The product of its digits is 30000, while the sum is 35.

The spelling of 125515415213 in words is "one hundred twenty-five billion, five hundred fifteen million, four hundred fifteen thousand, two hundred thirteen".