166006665 has 48 divisors (see below), whose sum is σ = 325555776. Its totient is φ = 80481600.

The previous prime is 166006661. The next prime is 166006669. The reversal of 166006665 is 566600661.

166006665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166006661) and next prime (166006669).

It is not a de Polignac number, because 166006665 - 2² = 166006661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166006661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7155 + ... + 19575.

It is an arithmetic number, because the mean of its divisors is an integer number (6782412).

Almost surely, 2^166006665 is an apocalyptic number.

166006665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166006665 is a deficient number, since it is larger than the sum of its proper divisors (159549111).

166006665 is a wasteful number, since it uses less digits than its factorization.

166006665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12452 (or 12440 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 166006665 is about 12884.3573762916. The cubic root of 166006665 is about 549.5938213203.

The spelling of 166006665 in words is "one hundred sixty-six million, six thousand, six hundred sixty-five".