165064261 has 4 divisors (see below), whose sum is σ = 172240992. Its totient is φ = 157887532.

The previous prime is 165064253. The next prime is 165064283. The reversal of 165064261 is 162460561.

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 a cyclic number.

It is not a de Polignac number, because 165064261 - 2³ = 165064253 is a prime.

It is a super-2 number, since 2×165064261² = 54492420518952242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165064661) 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, 3588331 + ... + 3588376.

It is an arithmetic number, because the mean of its divisors is an integer number (43060248).

Almost surely, 2^165064261 is an apocalyptic number.

It is an amenable number.

165064261 is a deficient number, since it is larger than the sum of its proper divisors (7176731).

165064261 is an equidigital number, since it uses as much as digits as its factorization.

165064261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7176730.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 165064261 is about 12847.7336912002. The cubic root of 165064261 is about 548.5518498710.

The spelling of 165064261 in words is "one hundred sixty-five million, sixty-four thousand, two hundred sixty-one".