166640369 has 8 divisors (see below), whose sum is σ = 190548288. Its totient is φ = 142758000.

The previous prime is 166640363. The next prime is 166640377. The reversal of 166640369 is 963046661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166640369 - 2¹² = 166636273 is a prime.

It is a super-2 number, since 2×166640369² = 55538025160912322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166640363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10619 + ... + 21119.

It is an arithmetic number, because the mean of its divisors is an integer number (23818536).

Almost surely, 2^166640369 is an apocalyptic number.

It is an amenable number.

166640369 is a deficient number, since it is larger than the sum of its proper divisors (23907919).

166640369 is a wasteful number, since it uses less digits than its factorization.

166640369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12775.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 166640369 is about 12908.9259429280. The cubic root of 166640369 is about 550.2922622993.

The spelling of 166640369 in words is "one hundred sixty-six million, six hundred forty thousand, three hundred sixty-nine".