166520289 has 16 divisors (see below), whose sum is σ = 239654912. Its totient is φ = 102238848.

The previous prime is 166520273. The next prime is 166520293. The reversal of 166520289 is 982025661.

It is not a de Polignac number, because 166520289 - 2⁴ = 166520273 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166520089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13152 + ... + 22494.

It is an arithmetic number, because the mean of its divisors is an integer number (14978432).

Almost surely, 2^166520289 is an apocalyptic number.

It is an amenable number.

166520289 is a deficient number, since it is larger than the sum of its proper divisors (73134623).

166520289 is a wasteful number, since it uses less digits than its factorization.

166520289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9816.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 166520289 is about 12904.2740593960. The cubic root of 166520289 is about 550.1600514917.

The spelling of 166520289 in words is "one hundred sixty-six million, five hundred twenty thousand, two hundred eighty-nine".