166689457 has 8 divisors (see below), whose sum is σ = 186072480. Its totient is φ = 148011360.

The previous prime is 166689421. The next prime is 166689463. The reversal of 166689457 is 754986661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166689457 - 2²⁷ = 32471729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166689157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175732 + ... + 176677.

It is an arithmetic number, because the mean of its divisors is an integer number (23259060).

Almost surely, 2^166689457 is an apocalyptic number.

It is an amenable number.

166689457 is a deficient number, since it is larger than the sum of its proper divisors (19383023).

166689457 is a wasteful number, since it uses less digits than its factorization.

166689457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352463.

The product of its digits is 2177280, while the sum is 52.

The square root of 166689457 is about 12910.8271230003. The cubic root of 166689457 is about 550.3462910134.

The spelling of 166689457 in words is "one hundred sixty-six million, six hundred eighty-nine thousand, four hundred fifty-seven".