666642676 has 24 divisors (see below), whose sum is σ = 1335660480. Its totient is φ = 285195072.

The previous prime is 666642671. The next prime is 666642731. The reversal of 666642676 is 676246666.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666642671) 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, 4990 + ... + 36853.

It is an arithmetic number, because the mean of its divisors is an integer number (55652520).

Almost surely, 2^666642676 is an apocalyptic number.

It is an amenable number.

666642676 is an abundant number, since it is smaller than the sum of its proper divisors (669017804).

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

666642676 is a wasteful number, since it uses less digits than its factorization.

666642676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42423 (or 42421 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 49.

The square root of 666642676 is about 25819.4243932741. The cubic root of 666642676 is about 873.5699857217.

The spelling of 666642676 in words is "six hundred sixty-six million, six hundred forty-two thousand, six hundred seventy-six".