65165261 has 4 divisors (see below), whose sum is σ = 74474592. Its totient is φ = 55855932.

The previous prime is 65165257. The next prime is 65165273. The reversal of 65165261 is 16256156.

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 65165261 - 2² = 65165257 is a prime.

It is a super-2 number, since 2×65165261² = 8493022482396242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65165761) 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, 4654655 + ... + 4654668.

It is an arithmetic number, because the mean of its divisors is an integer number (18618648).

Almost surely, 2^65165261 is an apocalyptic number.

It is an amenable number.

65165261 is a deficient number, since it is larger than the sum of its proper divisors (9309331).

65165261 is an equidigital number, since it uses as much as digits as its factorization.

65165261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309330.

The product of its digits is 10800, while the sum is 32.

The square root of 65165261 is about 8072.5002942087. The cubic root of 65165261 is about 402.4130408954.

The spelling of 65165261 in words is "sixty-five million, one hundred sixty-five thousand, two hundred sixty-one".