65165591 has 2 divisors, whose sum is σ = 65165592. Its totient is φ = 65165590.

The previous prime is 65165587. The next prime is 65165593. The reversal of 65165591 is 19556156.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65165591 - 2² = 65165587 is a prime.

Together with 65165593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65165593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32582795 + 32582796.

It is an arithmetic number, because the mean of its divisors is an integer number (32582796).

Almost surely, 2^65165591 is an apocalyptic number.

65165591 is a deficient number, since it is larger than the sum of its proper divisors (1).

65165591 is an equidigital number, since it uses as much as digits as its factorization.

65165591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 38.

The square root of 65165591 is about 8072.5207339467. The cubic root of 65165591 is about 402.4137201739.

It can be divided in two parts, 65165 and 591, that added together give a palindrome (65756).

The spelling of 65165591 in words is "sixty-five million, one hundred sixty-five thousand, five hundred ninety-one".