666667037407 has 12 divisors (see below), whose sum is σ = 775773066600. Its totient is φ = 571235518896.

The previous prime is 666667037389. The next prime is 666667037429. The reversal of 666667037407 is 704730766666.

It is not a de Polignac number, because 666667037407 - 2¹⁹ = 666666513119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666667037107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2155657 + ... + 2445442.

It is an arithmetic number, because the mean of its divisors is an integer number (64647755550).

Almost surely, 2^666667037407 is an apocalyptic number.

666667037407 is a deficient number, since it is larger than the sum of its proper divisors (109106029193).

666667037407 is a wasteful number, since it uses less digits than its factorization.

666667037407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4604070 (or 4604063 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 58.

The spelling of 666667037407 in words is "six hundred sixty-six billion, six hundred sixty-seven million, thirty-seven thousand, four hundred seven".