666768043764 has 60 divisors (see below), whose sum is σ = 1745935492224. Its totient is φ = 221889794256.

The previous prime is 666768043717. The next prime is 666768043769. The reversal of 666768043764 is 467340867666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666768043769) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1498494 + ... + 1891829.

Almost surely, 2^666768043764 is an apocalyptic number.

It is an amenable number.

666768043764 is an abundant number, since it is smaller than the sum of its proper divisors (1079167448460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666768043764 is a wasteful number, since it uses less digits than its factorization.

666768043764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390946 (or 3390935 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 63.

The spelling of 666768043764 in words is "six hundred sixty-six billion, seven hundred sixty-eight million, forty-three thousand, seven hundred sixty-four".