625724661 has 16 divisors (see below), whose sum is σ = 883960128. Its totient is φ = 392352000.

The previous prime is 625724651. The next prime is 625724669. The reversal of 625724661 is 166427526.

It is not a de Polignac number, because 625724661 - 2⁹ = 625724149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625724669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99511 + ... + 105611.

It is an arithmetic number, because the mean of its divisors is an integer number (55247508).

Almost surely, 2^625724661 is an apocalyptic number.

It is an amenable number.

625724661 is a deficient number, since it is larger than the sum of its proper divisors (258235467).

625724661 is a wasteful number, since it uses less digits than its factorization.

625724661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8132.

The product of its digits is 120960, while the sum is 39.

The square root of 625724661 is about 25014.4890213652. The cubic root of 625724661 is about 855.3182864777.

The spelling of 625724661 in words is "six hundred twenty-five million, seven hundred twenty-four thousand, six hundred sixty-one".