166906819 has 2 divisors, whose sum is σ = 166906820. Its totient is φ = 166906818.

The previous prime is 166906813. The next prime is 166906853. The reversal of 166906819 is 918609661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166906819 - 2⁵ = 166906787 is a prime.

It is a super-2 number, since 2×166906819² = 55715772457397522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166906813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83453409 + 83453410.

It is an arithmetic number, because the mean of its divisors is an integer number (83453410).

Almost surely, 2^166906819 is an apocalyptic number.

166906819 is a deficient number, since it is larger than the sum of its proper divisors (1).

166906819 is an equidigital number, since it uses as much as digits as its factorization.

166906819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 166906819 is about 12919.2421991385. The cubic root of 166906819 is about 550.5854031401.

The spelling of 166906819 in words is "one hundred sixty-six million, nine hundred six thousand, eight hundred nineteen".