666709406 has 16 divisors (see below), whose sum is σ = 1094475888. Its totient is φ = 302078400.

The previous prime is 666709399. The next prime is 666709423. The reversal of 666709406 is 604907666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41525 + ... + 55296.

It is an arithmetic number, because the mean of its divisors is an integer number (68404743).

Almost surely, 2^666709406 is an apocalyptic number.

666709406 is a deficient number, since it is larger than the sum of its proper divisors (427766482).

666709406 is a wasteful number, since it uses less digits than its factorization.

666709406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97147.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 666709406 is about 25820.7166050828. The cubic root of 666709406 is about 873.5991324607.

The spelling of 666709406 in words is "six hundred sixty-six million, seven hundred nine thousand, four hundred six".