666813730 has 32 divisors (see below), whose sum is σ = 1310447808. Its totient is φ = 242280000.

The previous prime is 666813673. The next prime is 666813739. The reversal of 666813730 is 37318666.

It is not an unprimeable number, because it can be changed into a prime (666813739) 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, 246264 + ... + 248956.

It is an arithmetic number, because the mean of its divisors is an integer number (40951494).

Almost surely, 2^666813730 is an apocalyptic number.

666813730 is a deficient number, since it is larger than the sum of its proper divisors (643634078).

666813730 is a wasteful number, since it uses less digits than its factorization.

666813730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4962.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 666813730 is about 25822.7366868812. The cubic root of 666813730 is about 873.6446958410.

The spelling of 666813730 in words is "six hundred sixty-six million, eight hundred thirteen thousand, seven hundred thirty".