166515499 has 2 divisors, whose sum is σ = 166515500. Its totient is φ = 166515498.

The previous prime is 166515463. The next prime is 166515509. The reversal of 166515499 is 994515661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166515499 - 2²⁵ = 132961067 is a prime.

It is a super-2 number, since 2×166515499² = 55454822814438002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166515599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83257749 + 83257750.

It is an arithmetic number, because the mean of its divisors is an integer number (83257750).

Almost surely, 2^166515499 is an apocalyptic number.

166515499 is a deficient number, since it is larger than the sum of its proper divisors (1).

166515499 is an equidigital number, since it uses as much as digits as its factorization.

166515499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 46.

The square root of 166515499 is about 12904.0884606391. The cubic root of 166515499 is about 550.1547762748.

The spelling of 166515499 in words is "one hundred sixty-six million, five hundred fifteen thousand, four hundred ninety-nine".