125123215613 has 4 divisors (see below), whose sum is σ = 136498053408. Its totient is φ = 113748377820.

The previous prime is 125123215571. The next prime is 125123215621. The reversal of 125123215613 is 316512321521.

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.

It is not a de Polignac number, because 125123215613 - 2¹⁰ = 125123214589 is a prime.

It is a super-3 number, since 3×125123215613³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125123215613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125123215643) 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, 5687418881 + ... + 5687418902.

It is an arithmetic number, because the mean of its divisors is an integer number (34124513352).

Almost surely, 2^125123215613 is an apocalyptic number.

It is an amenable number.

125123215613 is a deficient number, since it is larger than the sum of its proper divisors (11374837795).

125123215613 is a wasteful number, since it uses less digits than its factorization.

125123215613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374837794.

The product of its digits is 10800, while the sum is 32.

The spelling of 125123215613 in words is "one hundred twenty-five billion, one hundred twenty-three million, two hundred fifteen thousand, six hundred thirteen".