165613253 has 32 divisors (see below), whose sum is σ = 198696960. Its totient is φ = 136624320.

The previous prime is 165613223. The next prime is 165613313. The reversal of 165613253 is 352316561.

It is a cyclic number.

It is not a de Polignac number, because 165613253 - 2¹⁰ = 165612229 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 (165613223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 329000 + ... + 329502.

It is an arithmetic number, because the mean of its divisors is an integer number (6209280).

Almost surely, 2^165613253 is an apocalyptic number.

165613253 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165613253 is a deficient number, since it is larger than the sum of its proper divisors (33083707).

165613253 is a wasteful number, since it uses less digits than its factorization.

165613253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609.

The product of its digits is 16200, while the sum is 32.

The square root of 165613253 is about 12869.0812803401. The cubic root of 165613253 is about 549.1593250495.

The spelling of 165613253 in words is "one hundred sixty-five million, six hundred thirteen thousand, two hundred fifty-three".