166616667 has 12 divisors (see below), whose sum is σ = 275049840. Its totient is φ = 95209488.

The previous prime is 166616663. The next prime is 166616689. The reversal of 166616667 is 766616661.

It is not a de Polignac number, because 166616667 - 2² = 166616663 is a prime.

It is a super-2 number, since 2×166616667² = 55522227444377778, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166616663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1322292 + ... + 1322417.

It is an arithmetic number, because the mean of its divisors is an integer number (22920820).

Almost surely, 2^166616667 is an apocalyptic number.

166616667 is a deficient number, since it is larger than the sum of its proper divisors (108433173).

166616667 is a wasteful number, since it uses less digits than its factorization.

166616667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644722 (or 2644719 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 166616667 is about 12908.0078633382. The cubic root of 166616667 is about 550.2661708911.

The spelling of 166616667 in words is "one hundred sixty-six million, six hundred sixteen thousand, six hundred sixty-seven".