666704726 has 16 divisors (see below), whose sum is σ = 1044140544. Its totient is φ = 318674664.

The previous prime is 666704681. The next prime is 666704747. The reversal of 666704726 is 627407666.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 109601 + ... + 115523.

It is an arithmetic number, because the mean of its divisors is an integer number (65258784).

Almost surely, 2^666704726 is an apocalyptic number.

666704726 is a deficient number, since it is larger than the sum of its proper divisors (377435818).

666704726 is a wasteful number, since it uses less digits than its factorization.

666704726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8395.

The product of its (nonzero) digits is 508032, while the sum is 44.

The square root of 666704726 is about 25820.6259800184. The cubic root of 666704726 is about 873.5970883650.

The spelling of 666704726 in words is "six hundred sixty-six million, seven hundred four thousand, seven hundred twenty-six".