666736707407 has 12 divisors (see below), whose sum is σ = 722693287656. Its totient is φ = 614573794800.

The previous prime is 666736707401. The next prime is 666736707437. The reversal of 666736707407 is 704707637666.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-666736707407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666736707401) 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 11 ways as a sum of consecutive naturals, for example, 24944969 + ... + 24971682.

It is an arithmetic number, because the mean of its divisors is an integer number (60224440638).

Almost surely, 2^666736707407 is an apocalyptic number.

666736707407 is a deficient number, since it is larger than the sum of its proper divisors (55956580249).

666736707407 is a wasteful number, since it uses less digits than its factorization.

666736707407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49916726 (or 49916707 counting only the distinct ones).

The product of its (nonzero) digits is 37340352, while the sum is 59.

The spelling of 666736707407 in words is "six hundred sixty-six billion, seven hundred thirty-six million, seven hundred seven thousand, four hundred seven".