666776344 has 32 divisors (see below), whose sum is σ = 1347570000. Its totient is φ = 307469952.

The previous prime is 666776311. The next prime is 666776347. The reversal of 666776344 is 443677666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666776347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159027 + ... + 163165.

Almost surely, 2^666776344 is an apocalyptic number.

It is an amenable number.

666776344 is an abundant number, since it is smaller than the sum of its proper divisors (680793656).

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

666776344 is a wasteful number, since it uses less digits than its factorization.

666776344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5707 (or 5703 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 49.

The square root of 666776344 is about 25822.0127797970. The cubic root of 666776344 is about 873.6283680974.

The spelling of 666776344 in words is "six hundred sixty-six million, seven hundred seventy-six thousand, three hundred forty-four".