166864894 has 48 divisors (see below), whose sum is σ = 316738512. Its totient is φ = 65463552.

The previous prime is 166864891. The next prime is 166864903. The reversal of 166864894 is 498468661.

166864894 = T₄₄₀ + T₄₄₁ + ... + T₁₀₂₇.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166864891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60289 + ... + 62995.

It is an arithmetic number, because the mean of its divisors is an integer number (6598719).

Almost surely, 2^166864894 is an apocalyptic number.

166864894 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

166864894 is a deficient number, since it is larger than the sum of its proper divisors (149873618).

166864894 is a wasteful number, since it uses less digits than its factorization.

166864894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777 (or 2770 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 52.

The square root of 166864894 is about 12917.6195175427. The cubic root of 166864894 is about 550.5392991199.

The spelling of 166864894 in words is "one hundred sixty-six million, eight hundred sixty-four thousand, eight hundred ninety-four".