165660501 has 4 divisors (see below), whose sum is σ = 220880672. Its totient is φ = 110440332.

The previous prime is 165660491. The next prime is 165660511. The reversal of 165660501 is 105066561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (165660491) and next prime (165660511).

It is not a de Polignac number, because 165660501 - 2¹⁰ = 165659477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165660511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27610081 + ... + 27610086.

It is an arithmetic number, because the mean of its divisors is an integer number (55220168).

Almost surely, 2^165660501 is an apocalyptic number.

It is an amenable number.

165660501 is a deficient number, since it is larger than the sum of its proper divisors (55220171).

165660501 is an equidigital number, since it uses as much as digits as its factorization.

165660501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55220170.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 165660501 is about 12870.9168671078. The cubic root of 165660501 is about 549.2115435209.

The spelling of 165660501 in words is "one hundred sixty-five million, six hundred sixty thousand, five hundred one".