166039281 has 8 divisors (see below), whose sum is σ = 245984160. Its totient is φ = 110692836.

The previous prime is 166039267. The next prime is 166039327. The reversal of 166039281 is 182930661.

It is not a de Polignac number, because 166039281 - 2¹⁴ = 166022897 is a prime.

It is a super-2 number, since 2×166039281² = 55138085669993922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166039481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3074775 + ... + 3074828.

It is an arithmetic number, because the mean of its divisors is an integer number (30748020).

Almost surely, 2^166039281 is an apocalyptic number.

It is an amenable number.

166039281 is a deficient number, since it is larger than the sum of its proper divisors (79944879).

166039281 is an equidigital number, since it uses as much as digits as its factorization.

166039281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6149612 (or 6149606 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 166039281 is about 12885.6230349952. The cubic root of 166039281 is about 549.6298126026.

The spelling of 166039281 in words is "one hundred sixty-six million, thirty-nine thousand, two hundred eighty-one".