666392705 has 8 divisors (see below), whose sum is σ = 872368704. Its totient is φ = 484649200.

The previous prime is 666392689. The next prime is 666392759. The reversal of 666392705 is 507293666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666392705 - 2⁴ = 666392689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6058061 + ... + 6058170.

It is an arithmetic number, because the mean of its divisors is an integer number (109046088).

Almost surely, 2^666392705 is an apocalyptic number.

It is an amenable number.

666392705 is a deficient number, since it is larger than the sum of its proper divisors (205975999).

666392705 is a wasteful number, since it uses less digits than its factorization.

666392705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12116247.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 666392705 is about 25814.5831847040. The cubic root of 666392705 is about 873.4607845609.

The spelling of 666392705 in words is "six hundred sixty-six million, three hundred ninety-two thousand, seven hundred five".