666670407 has 16 divisors (see below), whose sum is σ = 988151808. Its totient is φ = 397023840.

The previous prime is 666670349. The next prime is 666670421. The reversal of 666670407 is 704076666.

It is a de Polignac number, because none of the positive numbers 2^k-666670407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666670447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274503 + ... + 276920.

It is an arithmetic number, because the mean of its divisors is an integer number (61759488).

Almost surely, 2^666670407 is an apocalyptic number.

666670407 is a deficient number, since it is larger than the sum of its proper divisors (321481401).

666670407 is a wasteful number, since it uses less digits than its factorization.

666670407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551470.

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 666670407 is about 25819.9614058581. The cubic root of 666670407 is about 873.5820984743.

The spelling of 666670407 in words is "six hundred sixty-six million, six hundred seventy thousand, four hundred seven".