166500959 has 4 divisors (see below), whose sum is σ = 170562000. Its totient is φ = 162439920.

The previous prime is 166500913. The next prime is 166500973. The reversal of 166500959 is 959005661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166500959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 4060999 = 166500959 / (1 + 6 + 6 + 5 + 0 + 0 + 9 + 5 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166500989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030459 + ... + 2030540.

It is an arithmetic number, because the mean of its divisors is an integer number (42640500).

Almost surely, 2^166500959 is an apocalyptic number.

166500959 is a deficient number, since it is larger than the sum of its proper divisors (4061041).

166500959 is an equidigital number, since it uses as much as digits as its factorization.

166500959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061040.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 166500959 is about 12903.5250610056. The cubic root of 166500959 is about 550.1387627839.

The spelling of 166500959 in words is "one hundred sixty-six million, five hundred thousand, nine hundred fifty-nine".