668371563 has 24 divisors (see below), whose sum is σ = 1004230656. Its totient is φ = 427892400.

The previous prime is 668371523. The next prime is 668371567. The reversal of 668371563 is 365173866.

668371563 is a `hidden beast` number, since 6 + 6 + 83 + 7 + 1 + 563 = 666.

It is not a de Polignac number, because 668371563 - 2⁸ = 668371307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668371567) 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 23 ways as a sum of consecutive naturals, for example, 27406 + ... + 45692.

It is an arithmetic number, because the mean of its divisors is an integer number (41842944).

Almost surely, 2^668371563 is an apocalyptic number.

668371563 is a deficient number, since it is larger than the sum of its proper divisors (335859093).

668371563 is a wasteful number, since it uses less digits than its factorization.

668371563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18455 (or 18452 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 668371563 is about 25852.8830693987. The cubic root of 668371563 is about 874.3245128994.

The spelling of 668371563 in words is "six hundred sixty-eight million, three hundred seventy-one thousand, five hundred sixty-three".