166745569 has 9 divisors (see below), whose sum is σ = 171866457. Its totient is φ = 161774064.

The previous prime is 166745521. The next prime is 166745573. The reversal of 166745569 is 965547661.

The square root of 166745569 is 12913.

It is a perfect power (a square), and thus also a powerful number.

166745569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 68973025 + 97772544 = 8305^2 + 9888^2 .

It is not a de Polignac number, because 166745569 - 2⁹ = 166745057 is a prime.

It is a super-2 number, since 2×166745569² = 55608169562267522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166745669) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 477607 + ... + 477955.

It is an arithmetic number, because the mean of its divisors is an integer number (19096273).

Almost surely, 2^166745569 is an apocalyptic number.

166745569 is the 12913-rd square number.

166745569 is the 6457-th centered octagonal number.

It is an amenable number.

166745569 is a deficient number, since it is larger than the sum of its proper divisors (5120888).

166745569 is an frugal number, since it uses more digits than its factorization.

166745569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 386 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 49.

The cubic root of 166745569 is about 550.4080377032.

Multiplying 166745569 by its sum of digits (49), we get a square (8170532881 = 90391²).

The spelling of 166745569 in words is "one hundred sixty-six million, seven hundred forty-five thousand, five hundred sixty-nine".