625344440691 has 4 divisors (see below), whose sum is σ = 833792587592. Its totient is φ = 416896293792.

The previous prime is 625344440659. The next prime is 625344440761. The reversal of 625344440691 is 196044443526.

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

It is not a de Polignac number, because 625344440691 - 2⁵ = 625344440659 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 625344440691.

It is not an unprimeable number, because it can be changed into a prime (625344440621) 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, 104224073446 + ... + 104224073451.

It is an arithmetic number, because the mean of its divisors is an integer number (208448146898).

Almost surely, 2^625344440691 is an apocalyptic number.

625344440691 is a deficient number, since it is larger than the sum of its proper divisors (208448146901).

625344440691 is a wasteful number, since it uses less digits than its factorization.

625344440691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208448146900.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 625344440691 in words is "six hundred twenty-five billion, three hundred forty-four million, four hundred forty thousand, six hundred ninety-one".