655664401 has 8 divisors (see below), whose sum is σ = 749533824. Its totient is φ = 561845760.

The previous prime is 655664389. The next prime is 655664411. The reversal of 655664401 is 104466556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 655664401 - 2⁹ = 655663889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655664411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20916 + ... + 41818.

It is an arithmetic number, because the mean of its divisors is an integer number (93691728).

Almost surely, 2^655664401 is an apocalyptic number.

It is an amenable number.

655664401 is a deficient number, since it is larger than the sum of its proper divisors (93869423).

655664401 is a wasteful number, since it uses less digits than its factorization.

655664401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25391.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 655664401 is about 25605.9446418210. The cubic root of 655664401 is about 868.7481007774.

The spelling of 655664401 in words is "six hundred fifty-five million, six hundred sixty-four thousand, four hundred one".