668963871 has 6 divisors (see below), whose sum is σ = 966281160. Its totient is φ = 445975908.

The previous prime is 668963861. The next prime is 668963887. The reversal of 668963871 is 178369866.

It is a happy number.

It is not a de Polignac number, because 668963871 - 2⁶ = 668963807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668963861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37164651 + ... + 37164668.

It is an arithmetic number, because the mean of its divisors is an integer number (161046860).

Almost surely, 2^668963871 is an apocalyptic number.

668963871 is a deficient number, since it is larger than the sum of its proper divisors (297317289).

668963871 is a wasteful number, since it uses less digits than its factorization.

668963871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74329325 (or 74329322 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 668963871 is about 25864.3358894057. The cubic root of 668963871 is about 874.5827108488.

The spelling of 668963871 in words is "six hundred sixty-eight million, nine hundred sixty-three thousand, eight hundred seventy-one".