166016399 has 2 divisors, whose sum is σ = 166016400. Its totient is φ = 166016398.

The previous prime is 166016393. The next prime is 166016449. The reversal of 166016399 is 993610661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166016399 - 2⁸ = 166016143 is a prime.

It is a super-2 number, since 2×166016399² = 55122889473854402, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166016393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83008199 + 83008200.

It is an arithmetic number, because the mean of its divisors is an integer number (83008200).

Almost surely, 2^166016399 is an apocalyptic number.

166016399 is a deficient number, since it is larger than the sum of its proper divisors (1).

166016399 is an equidigital number, since it uses as much as digits as its factorization.

166016399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 166016399 is about 12884.7351156320. The cubic root of 166016399 is about 549.6045631414.

The spelling of 166016399 in words is "one hundred sixty-six million, sixteen thousand, three hundred ninety-nine".