655001663 has 4 divisors (see below), whose sum is σ = 658395648. Its totient is φ = 651607680.

The previous prime is 655001651. The next prime is 655001689. The reversal of 655001663 is 366100556.

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

It is a cyclic number.

It is not a de Polignac number, because 655001663 - 2²⁰ = 653953087 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 (655001563) 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, 1696703 + ... + 1697088.

It is an arithmetic number, because the mean of its divisors is an integer number (164598912).

Almost surely, 2^655001663 is an apocalyptic number.

655001663 is a deficient number, since it is larger than the sum of its proper divisors (3393985).

655001663 is a wasteful number, since it uses less digits than its factorization.

655001663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3393984.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 655001663 is about 25593.0002735123. Note that the first 3 decimals coincide. The cubic root of 655001663 is about 868.4552952532.

The spelling of 655001663 in words is "six hundred fifty-five million, one thousand, six hundred sixty-three".