625635536525 has 6 divisors (see below), whose sum is σ = 775788065322. Its totient is φ = 500508429200.

The previous prime is 625635536521. The next prime is 625635536551. The reversal of 625635536525 is 525635536526.

It can be written as a sum of positive squares in 3 ways, for example, as 2170534921 + 623465001604 = 46589^2 + 789598^2 .

It is not a de Polignac number, because 625635536525 - 2² = 625635536521 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 (625635536521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12512710706 + ... + 12512710755.

It is an arithmetic number, because the mean of its divisors is an integer number (129298010887).

Almost surely, 2^625635536525 is an apocalyptic number.

It is an amenable number.

625635536525 is a deficient number, since it is larger than the sum of its proper divisors (150152528797).

625635536525 is a wasteful number, since it uses less digits than its factorization.

625635536525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25025421471 (or 25025421466 counting only the distinct ones).

The product of its digits is 24300000, while the sum is 53.

Subtracting from 625635536525 its reverse (525635536526), we obtain a palindrome (99999999999).

The spelling of 625635536525 in words is "six hundred twenty-five billion, six hundred thirty-five million, five hundred thirty-six thousand, five hundred twenty-five".