165336551 has 4 divisors (see below), whose sum is σ = 165399072. Its totient is φ = 165274032.

The previous prime is 165336517. The next prime is 165336557. The reversal of 165336551 is 155633561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155633561 = 11351 ⋅13711.

It is a cyclic number.

It is not a de Polignac number, because 165336551 - 2¹⁴ = 165320167 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 (165336557) 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, 27110 + ... + 32643.

It is an arithmetic number, because the mean of its divisors is an integer number (41349768).

Almost surely, 2^165336551 is an apocalyptic number.

165336551 is a deficient number, since it is larger than the sum of its proper divisors (62521).

165336551 is an equidigital number, since it uses as much as digits as its factorization.

165336551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62520.

The product of its digits is 40500, while the sum is 35.

The square root of 165336551 is about 12858.3261352324. The cubic root of 165336551 is about 548.8533145381.

The spelling of 165336551 in words is "one hundred sixty-five million, three hundred thirty-six thousand, five hundred fifty-one".