66188557199 has 2 divisors, whose sum is σ = 66188557200. Its totient is φ = 66188557198.

The previous prime is 66188557159. The next prime is 66188557291. The reversal of 66188557199 is 99175588166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66188557199 - 2²⁴ = 66171779983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66188557139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33094278599 + 33094278600.

It is an arithmetic number, because the mean of its divisors is an integer number (33094278600).

Almost surely, 2^66188557199 is an apocalyptic number.

66188557199 is a deficient number, since it is larger than the sum of its proper divisors (1).

66188557199 is an equidigital number, since it uses as much as digits as its factorization.

66188557199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32659200, while the sum is 65.

The spelling of 66188557199 in words is "sixty-six billion, one hundred eighty-eight million, five hundred fifty-seven thousand, one hundred ninety-nine".