666764676 has 48 divisors (see below), whose sum is σ = 1733114880. Its totient is φ = 221680800.

The previous prime is 666764669. The next prime is 666764677. The reversal of 666764676 is 676467666.

It is a super-2 number, since 2×666764676² = 889150266322769952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (666764677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35101 + ... + 50651.

It is an arithmetic number, because the mean of its divisors is an integer number (36106560).

Almost surely, 2^666764676 is an apocalyptic number.

It is an amenable number.

666764676 is an abundant number, since it is smaller than the sum of its proper divisors (1066350204).

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

666764676 is a wasteful number, since it uses less digits than its factorization.

666764676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15961 (or 15953 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 54.

The square root of 666764676 is about 25821.7868475441. The cubic root of 666764676 is about 873.6232721581.

The spelling of 666764676 in words is "six hundred sixty-six million, seven hundred sixty-four thousand, six hundred seventy-six".