166766663 has 4 divisors (see below), whose sum is σ = 190590480. Its totient is φ = 142942848.

The previous prime is 166766657. The next prime is 166766683. The reversal of 166766663 is 366667661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166766663 - 2¹² = 166762567 is a prime.

It is a super-2 number, since 2×166766663² = 55622239776311138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166766653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11911898 + ... + 11911911.

It is an arithmetic number, because the mean of its divisors is an integer number (47647620).

Almost surely, 2^166766663 is an apocalyptic number.

166766663 is a deficient number, since it is larger than the sum of its proper divisors (23823817).

166766663 is an equidigital number, since it uses as much as digits as its factorization.

166766663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23823816.

The product of its digits is 979776, while the sum is 47.

The square root of 166766663 is about 12913.8167479642. The cubic root of 166766663 is about 550.4312463511.

The spelling of 166766663 in words is "one hundred sixty-six million, seven hundred sixty-six thousand, six hundred sixty-three".