666349656 has 64 divisors (see below), whose sum is σ = 1905811200. Its totient is φ = 190190208.

The previous prime is 666349643. The next prime is 666349667. The reversal of 666349656 is 656943666.

It is a junction number, because it is equal to n+sod(n) for n = 666349599 and 666349608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269755 + ... + 272213.

It is an arithmetic number, because the mean of its divisors is an integer number (29778300).

Almost surely, 2^666349656 is an apocalyptic number.

It is an amenable number.

666349656 is an abundant number, since it is smaller than the sum of its proper divisors (1239461544).

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

666349656 is a wasteful number, since it uses less digits than its factorization.

666349656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088 (or 4084 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 51.

The square root of 666349656 is about 25813.7493595952. The cubic root of 666349656 is about 873.4419756200.

The spelling of 666349656 in words is "six hundred sixty-six million, three hundred forty-nine thousand, six hundred fifty-six".