165455517 has 4 divisors (see below), whose sum is σ = 220607360. Its totient is φ = 110303676.

The previous prime is 165455513. The next prime is 165455551. The reversal of 165455517 is 715554561.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 715554561 = 3 ⋅238518187.

It is not a de Polignac number, because 165455517 - 2² = 165455513 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 (165455513) 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, 27575917 + ... + 27575922.

It is an arithmetic number, because the mean of its divisors is an integer number (55151840).

Almost surely, 2^165455517 is an apocalyptic number.

It is an amenable number.

165455517 is a deficient number, since it is larger than the sum of its proper divisors (55151843).

165455517 is an equidigital number, since it uses as much as digits as its factorization.

165455517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55151842.

The product of its digits is 105000, while the sum is 39.

The square root of 165455517 is about 12862.9513331894. The cubic root of 165455517 is about 548.9849233254.

The spelling of 165455517 in words is "one hundred sixty-five million, four hundred fifty-five thousand, five hundred seventeen".