165979459 has 4 divisors (see below), whose sum is σ = 174715240. Its totient is φ = 157243680.

The previous prime is 165979433. The next prime is 165979493. The reversal of 165979459 is 954979561.

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-165979459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165979409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4367862 + ... + 4367899.

It is an arithmetic number, because the mean of its divisors is an integer number (43678810).

Almost surely, 2^165979459 is an apocalyptic number.

165979459 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

165979459 is a deficient number, since it is larger than the sum of its proper divisors (8735781).

165979459 is an equidigital number, since it uses as much as digits as its factorization.

165979459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8735780.

The product of its digits is 3061800, while the sum is 55.

The square root of 165979459 is about 12883.3015566663. The cubic root of 165979459 is about 549.5637962881.

It can be divided in two parts, 1659 and 79459, that added together give a palindrome (81118).

The spelling of 165979459 in words is "one hundred sixty-five million, nine hundred seventy-nine thousand, four hundred fifty-nine".