166039967 has 4 divisors (see below), whose sum is σ = 173259120. Its totient is φ = 158820816.

The previous prime is 166039963. The next prime is 166040009. The reversal of 166039967 is 769930661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166039967 - 2² = 166039963 is a prime.

It is a super-2 number, since 2×166039967² = 55138541282722178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166039963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3609542 + ... + 3609587.

It is an arithmetic number, because the mean of its divisors is an integer number (43314780).

Almost surely, 2^166039967 is an apocalyptic number.

166039967 is a deficient number, since it is larger than the sum of its proper divisors (7219153).

166039967 is an equidigital number, since it uses as much as digits as its factorization.

166039967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7219152.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 166039967 is about 12885.6496537815. The cubic root of 166039967 is about 549.6305695430.

The spelling of 166039967 in words is "one hundred sixty-six million, thirty-nine thousand, nine hundred sixty-seven".