666634139599 has 2 divisors, whose sum is σ = 666634139600. Its totient is φ = 666634139598.

The previous prime is 666634139581. The next prime is 666634139627. The reversal of 666634139599 is 995931436666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666634139599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666634139519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333317069799 + 333317069800.

It is an arithmetic number, because the mean of its divisors is an integer number (333317069800).

Almost surely, 2^666634139599 is an apocalyptic number.

666634139599 is a deficient number, since it is larger than the sum of its proper divisors (1).

666634139599 is an equidigital number, since it uses as much as digits as its factorization.

666634139599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170061120, while the sum is 67.

The spelling of 666634139599 in words is "six hundred sixty-six billion, six hundred thirty-four million, one hundred thirty-nine thousand, five hundred ninety-nine".