625965487409 has 4 divisors (see below), whose sum is σ = 625990934016. Its totient is φ = 625940040804.

The previous prime is 625965487379. The next prime is 625965487421. The reversal of 625965487409 is 904784569526.

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 625965487409 - 2²⁴ = 625948710193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625965487489) 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, 12686369 + ... + 12735614.

It is an arithmetic number, because the mean of its divisors is an integer number (156497733504).

Almost surely, 2^625965487409 is an apocalyptic number.

It is an amenable number.

625965487409 is a deficient number, since it is larger than the sum of its proper divisors (25446607).

625965487409 is a wasteful number, since it uses less digits than its factorization.

625965487409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25446606.

The product of its (nonzero) digits is 130636800, while the sum is 65.

The spelling of 625965487409 in words is "six hundred twenty-five billion, nine hundred sixty-five million, four hundred eighty-seven thousand, four hundred nine".