166551863 has 2 divisors, whose sum is σ = 166551864. Its totient is φ = 166551862.

The previous prime is 166551823. The next prime is 166551919. The reversal of 166551863 is 368155661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166551863 - 2²⁰ = 165503287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166551863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166551823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83275931 + 83275932.

It is an arithmetic number, because the mean of its divisors is an integer number (83275932).

Almost surely, 2^166551863 is an apocalyptic number.

166551863 is a deficient number, since it is larger than the sum of its proper divisors (1).

166551863 is an equidigital number, since it uses as much as digits as its factorization.

166551863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 166551863 is about 12905.4973945215. The cubic root of 166551863 is about 550.1948213402.

The spelling of 166551863 in words is "one hundred sixty-six million, five hundred fifty-one thousand, eight hundred sixty-three".