666740737007 has 4 divisors (see below), whose sum is σ = 667299615600. Its totient is φ = 666181858416.

The previous prime is 666740736989. The next prime is 666740737027. The reversal of 666740737007 is 700737047666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666740737007 - 2¹⁸ = 666740474863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666740737007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666740737027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279437507 + ... + 279439892.

It is an arithmetic number, because the mean of its divisors is an integer number (166824903900).

Almost surely, 2^666740737007 is an apocalyptic number.

666740737007 is a deficient number, since it is larger than the sum of its proper divisors (558878593).

666740737007 is a wasteful number, since it uses less digits than its factorization.

666740737007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558878592.

The product of its (nonzero) digits is 6223392, while the sum is 53.

The spelling of 666740737007 in words is "six hundred sixty-six billion, seven hundred forty million, seven hundred thirty-seven thousand, seven".