166994499799 has 2 divisors, whose sum is σ = 166994499800. Its totient is φ = 166994499798.

The previous prime is 166994499653. The next prime is 166994499827. The reversal of 166994499799 is 997994499661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166994499799 - 2³⁷ = 29555546327 is a prime.

It is a super-2 number, since 2×166994499799² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166994499299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83497249899 + 83497249900.

It is an arithmetic number, because the mean of its divisors is an integer number (83497249900).

Almost surely, 2^166994499799 is an apocalyptic number.

166994499799 is a deficient number, since it is larger than the sum of its proper divisors (1).

166994499799 is an equidigital number, since it uses as much as digits as its factorization.

166994499799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2142770112, while the sum is 82.

The spelling of 166994499799 in words is "one hundred sixty-six billion, nine hundred ninety-four million, four hundred ninety-nine thousand, seven hundred ninety-nine".