666242764 has 12 divisors (see below), whose sum is σ = 1271918088. Its totient is φ = 302837600.

The previous prime is 666242747. The next prime is 666242779. The reversal of 666242764 is 467242666.

It is a self number, because there is not a number n which added to its sum of digits gives 666242764.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7570897 + ... + 7570984.

It is an arithmetic number, because the mean of its divisors is an integer number (105993174).

Almost surely, 2^666242764 is an apocalyptic number.

It is an amenable number.

666242764 is a deficient number, since it is larger than the sum of its proper divisors (605675324).

666242764 is a wasteful number, since it uses less digits than its factorization.

666242764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15141896 (or 15141894 counting only the distinct ones).

The product of its digits is 580608, while the sum is 43.

The square root of 666242764 is about 25811.6788295531. The cubic root of 666242764 is about 873.3952689340.

The spelling of 666242764 in words is "six hundred sixty-six million, two hundred forty-two thousand, seven hundred sixty-four".