166599123287 has 2 divisors, whose sum is σ = 166599123288. Its totient is φ = 166599123286.

The previous prime is 166599123253. The next prime is 166599123389. The reversal of 166599123287 is 782321995661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166599123287 - 2²⁴ = 166582346071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166599123247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83299561643 + 83299561644.

It is an arithmetic number, because the mean of its divisors is an integer number (83299561644).

Almost surely, 2^166599123287 is an apocalyptic number.

166599123287 is a deficient number, since it is larger than the sum of its proper divisors (1).

166599123287 is an equidigital number, since it uses as much as digits as its factorization.

166599123287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 59.

The spelling of 166599123287 in words is "one hundred sixty-six billion, five hundred ninety-nine million, one hundred twenty-three thousand, two hundred eighty-seven".