668651711 has 24 divisors (see below), whose sum is σ = 830175840. Its totient is φ = 527319936.

The previous prime is 668651693. The next prime is 668651719. The reversal of 668651711 is 117156866.

It is not a de Polignac number, because 668651711 - 2¹⁸ = 668389567 is a prime.

It is a super-2 number, since 2×668651711² = 894190221246455042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668651719) 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 23 ways as a sum of consecutive naturals, for example, 459461 + ... + 460913.

It is an arithmetic number, because the mean of its divisors is an integer number (34590660).

Almost surely, 2^668651711 is an apocalyptic number.

668651711 is a deficient number, since it is larger than the sum of its proper divisors (161524129).

668651711 is a wasteful number, since it uses less digits than its factorization.

668651711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875 (or 1862 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 668651711 is about 25858.3006208838. The cubic root of 668651711 is about 874.4466535683.

The spelling of 668651711 in words is "six hundred sixty-eight million, six hundred fifty-one thousand, seven hundred eleven".