66979675099 has 2 divisors, whose sum is σ = 66979675100. Its totient is φ = 66979675098.

The previous prime is 66979675097. The next prime is 66979675151. The reversal of 66979675099 is 99057697966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66979675099 - 2¹ = 66979675097 is a prime.

Together with 66979675097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66979675097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33489837549 + 33489837550.

It is an arithmetic number, because the mean of its divisors is an integer number (33489837550).

Almost surely, 2^66979675099 is an apocalyptic number.

66979675099 is a deficient number, since it is larger than the sum of its proper divisors (1).

66979675099 is an equidigital number, since it uses as much as digits as its factorization.

66979675099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 347208120, while the sum is 73.

The spelling of 66979675099 in words is "sixty-six billion, nine hundred seventy-nine million, six hundred seventy-five thousand, ninety-nine".