655645663 has 4 divisors (see below), whose sum is σ = 655717968. Its totient is φ = 655573360.

The previous prime is 655645643. The next prime is 655645693. The reversal of 655645663 is 366546556.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 655645663 - 2²⁹ = 118774751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655645643) 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, 20206 + ... + 41467.

It is an arithmetic number, because the mean of its divisors is an integer number (163929492).

Almost surely, 2^655645663 is an apocalyptic number.

655645663 is a deficient number, since it is larger than the sum of its proper divisors (72305).

655645663 is a wasteful number, since it uses less digits than its factorization.

655645663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72304.

The product of its digits is 1944000, while the sum is 46.

The square root of 655645663 is about 25605.5787476089. The cubic root of 655645663 is about 868.7398248174.

The spelling of 655645663 in words is "six hundred fifty-five million, six hundred forty-five thousand, six hundred sixty-three".