425251815523 has 4 divisors (see below), whose sum is σ = 425386264408. Its totient is φ = 425117366640.

The previous prime is 425251815517. The next prime is 425251815559. The reversal of 425251815523 is 325518152524.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 425251815523 - 2⁵ = 425251815491 is a prime.

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 425251815523.

It is not an unprimeable number, because it can be changed into a prime (425251813523) 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, 67219698 + ... + 67226023.

It is an arithmetic number, because the mean of its divisors is an integer number (106346566102).

Almost surely, 2^425251815523 is an apocalyptic number.

425251815523 is a deficient number, since it is larger than the sum of its proper divisors (134448885).

425251815523 is a wasteful number, since it uses less digits than its factorization.

425251815523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134448884.

The product of its digits is 480000, while the sum is 43.

The spelling of 425251815523 in words is "four hundred twenty-five billion, two hundred fifty-one million, eight hundred fifteen thousand, five hundred twenty-three".