655625661 has 16 divisors (see below), whose sum is σ = 893103360. Its totient is φ = 427714560.

The previous prime is 655625639. The next prime is 655625669. The reversal of 655625661 is 166526556.

655625661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 655625661 - 2¹⁵ = 655592893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655625669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14541 + ... + 39021.

It is an arithmetic number, because the mean of its divisors is an integer number (55818960).

Almost surely, 2^655625661 is an apocalyptic number.

It is an amenable number.

655625661 is a deficient number, since it is larger than the sum of its proper divisors (237477699).

655625661 is a wasteful number, since it uses less digits than its factorization.

655625661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24676.

The product of its digits is 324000, while the sum is 42.

The square root of 655625661 is about 25605.1881656824. The cubic root of 655625661 is about 868.7309904161.

The spelling of 655625661 in words is "six hundred fifty-five million, six hundred twenty-five thousand, six hundred sixty-one".