668761911 has 12 divisors (see below), whose sum is σ = 974539488. Its totient is φ = 441895104.

The previous prime is 668761909. The next prime is 668761927. The reversal of 668761911 is 119167866.

It is not a de Polignac number, because 668761911 - 2¹ = 668761909 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668761901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 327775 + ... + 329808.

It is an arithmetic number, because the mean of its divisors is an integer number (81211624).

Almost surely, 2^668761911 is an apocalyptic number.

668761911 is a deficient number, since it is larger than the sum of its proper divisors (305777577).

668761911 is a wasteful number, since it uses less digits than its factorization.

668761911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657702 (or 657699 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 668761911 is about 25860.4313769125. The cubic root of 668761911 is about 874.4946899008.

The spelling of 668761911 in words is "six hundred sixty-eight million, seven hundred sixty-one thousand, nine hundred eleven".