166066690 has 32 divisors (see below), whose sum is σ = 312514560. Its totient is φ = 63460800.

The previous prime is 166066643. The next prime is 166066697. The reversal of 166066690 is 96660661.

It is a happy number.

166066690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166066690² = 55156291055112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166066697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21100 + ... + 27880.

It is an arithmetic number, because the mean of its divisors is an integer number (9766080).

Almost surely, 2^166066690 is an apocalyptic number.

166066690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166066690 is a deficient number, since it is larger than the sum of its proper divisors (146447870).

166066690 is a wasteful number, since it uses less digits than its factorization.

166066690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6898.

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

The square root of 166066690 is about 12886.6865407676. The cubic root of 166066690 is about 549.6600543915.

The spelling of 166066690 in words is "one hundred sixty-six million, sixty-six thousand, six hundred ninety".