666776940 has 24 divisors (see below), whose sum is σ = 1866975600. Its totient is φ = 177807168.

The previous prime is 666776939. The next prime is 666776951. The reversal of 666776940 is 49677666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5556415 + ... + 5556534.

It is an arithmetic number, because the mean of its divisors is an integer number (77790650).

Almost surely, 2^666776940 is an apocalyptic number.

666776940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666776940 is an abundant number, since it is smaller than the sum of its proper divisors (1200198660).

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

666776940 is a wasteful number, since it uses less digits than its factorization.

666776940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112961 (or 11112959 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 51.

The square root of 666776940 is about 25822.0243203355. The cubic root of 666776940 is about 873.6286283957.

The spelling of 666776940 in words is "six hundred sixty-six million, seven hundred seventy-six thousand, nine hundred forty".