625920478809 has 4 divisors (see below), whose sum is σ = 834560638416. Its totient is φ = 417280319204.

The previous prime is 625920478787. The next prime is 625920478811. The reversal of 625920478809 is 908874029526.

625920478809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 625920478809 - 2⁸ = 625920478553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (625920478889) 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, 104320079799 + ... + 104320079804.

It is an arithmetic number, because the mean of its divisors is an integer number (208640159604).

Almost surely, 2^625920478809 is an apocalyptic number.

It is an amenable number.

625920478809 is a deficient number, since it is larger than the sum of its proper divisors (208640159607).

625920478809 is a wasteful number, since it uses less digits than its factorization.

625920478809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208640159606.

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 625920478809 in words is "six hundred twenty-five billion, nine hundred twenty million, four hundred seventy-eight thousand, eight hundred nine".