166599123247 has 2 divisors, whose sum is σ = 166599123248. Its totient is φ = 166599123246.

The previous prime is 166599123193. The next prime is 166599123253. The reversal of 166599123247 is 742321995661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166599123247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166599123287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83299561623 + 83299561624.

It is an arithmetic number, because the mean of its divisors is an integer number (83299561624).

Almost surely, 2^166599123247 is an apocalyptic number.

166599123247 is a deficient number, since it is larger than the sum of its proper divisors (1).

166599123247 is an equidigital number, since it uses as much as digits as its factorization.

166599123247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 55.

The spelling of 166599123247 in words is "one hundred sixty-six billion, five hundred ninety-nine million, one hundred twenty-three thousand, two hundred forty-seven".