166998687 has 8 divisors (see below), whose sum is σ = 222942720. Its totient is φ = 111193560.

The previous prime is 166998683. The next prime is 166998719. The reversal of 166998687 is 786899661.

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

It is not a de Polignac number, because 166998687 - 2² = 166998683 is a prime.

It is a super-2 number, since 2×166998687² = 55777122919447938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166998687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166998683) 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, 31887 + ... + 36752.

It is an arithmetic number, because the mean of its divisors is an integer number (27867840).

Almost surely, 2^166998687 is an apocalyptic number.

166998687 is a deficient number, since it is larger than the sum of its proper divisors (55944033).

166998687 is an equidigital number, since it uses as much as digits as its factorization.

166998687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69453.

The product of its digits is 7838208, while the sum is 60.

The square root of 166998687 is about 12922.7971817250. The cubic root of 166998687 is about 550.6864014151.

The spelling of 166998687 in words is "one hundred sixty-six million, nine hundred ninety-eight thousand, six hundred eighty-seven".