166225563 has 12 divisors (see below), whose sum is σ = 274404208. Its totient is φ = 94986000.

The previous prime is 166225537. The next prime is 166225667. The reversal of 166225563 is 365522661.

It is a happy number.

166225563 is a `hidden beast` number, since 16 + 62 + 25 + 563 = 666.

It is not a de Polignac number, because 166225563 - 2¹⁸ = 165963419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166225363) 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, 1319188 + ... + 1319313.

Almost surely, 2^166225563 is an apocalyptic number.

166225563 is a deficient number, since it is larger than the sum of its proper divisors (108178645).

166225563 is a wasteful number, since it uses less digits than its factorization.

166225563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638514 (or 2638511 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 166225563 is about 12892.8492971880. The cubic root of 166225563 is about 549.8352818033.

It can be divided in two parts, 1662 and 25563, that added together give a square (27225 = 165²).

The spelling of 166225563 in words is "one hundred sixty-six million, two hundred twenty-five thousand, five hundred sixty-three".