666666670407 has 16 divisors (see below), whose sum is σ = 927585035520. Its totient is φ = 425098409472.

The previous prime is 666666670391. The next prime is 666666670447. The reversal of 666666670407 is 704076666666.

666666670407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666666670407 - 2⁴ = 666666670391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666670447) 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, 1120344 + ... + 1608882.

It is an arithmetic number, because the mean of its divisors is an integer number (57974064720).

Almost surely, 2^666666670407 is an apocalyptic number.

666666670407 is a deficient number, since it is larger than the sum of its proper divisors (260918365113).

666666670407 is a wasteful number, since it uses less digits than its factorization.

666666670407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508342.

The product of its (nonzero) digits is 54867456, while the sum is 60.

The spelling of 666666670407 in words is "six hundred sixty-six billion, six hundred sixty-six million, six hundred seventy thousand, four hundred seven".