66166906 has 16 divisors (see below), whose sum is σ = 111533184. Its totient is φ = 29210544.

The previous prime is 66166897. The next prime is 66166943. The reversal of 66166906 is 60966166.

It is a happy number.

It is a super-2 number, since 2×66166906² = 8756118899225672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54726 + ... + 55921.

It is an arithmetic number, because the mean of its divisors is an integer number (6970824).

Almost surely, 2^66166906 is an apocalyptic number.

66166906 is a deficient number, since it is larger than the sum of its proper divisors (45366278).

66166906 is a wasteful number, since it uses less digits than its factorization.

66166906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110685.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 66166906 is about 8134.3042726468. The cubic root of 66166906 is about 404.4643755077.

The spelling of 66166906 in words is "sixty-six million, one hundred sixty-six thousand, nine hundred six".