166212745 has 4 divisors (see below), whose sum is σ = 199455300. Its totient is φ = 132970192.

The previous prime is 166212737. The next prime is 166212763. The reversal of 166212745 is 547212661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547212661 = 137 ⋅3994253.

It can be written as a sum of positive squares in 2 ways, for example, as 18079504 + 148133241 = 4252^2 + 12171^2 .

It is a cyclic number.

It is not a de Polignac number, because 166212745 - 2³ = 166212737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166212745.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16621270 + ... + 16621279.

It is an arithmetic number, because the mean of its divisors is an integer number (49863825).

Almost surely, 2^166212745 is an apocalyptic number.

It is an amenable number.

166212745 is a deficient number, since it is larger than the sum of its proper divisors (33242555).

166212745 is an equidigital number, since it uses as much as digits as its factorization.

166212745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33242554.

The product of its digits is 20160, while the sum is 34.

The square root of 166212745 is about 12892.3521903491. The cubic root of 166212745 is about 549.8211484581.

The spelling of 166212745 in words is "one hundred sixty-six million, two hundred twelve thousand, seven hundred forty-five".