65608891 has 2 divisors, whose sum is σ = 65608892. Its totient is φ = 65608890.

The previous prime is 65608883. The next prime is 65608901. The reversal of 65608891 is 19880656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65608891 - 2³ = 65608883 is a prime.

It is not a weakly prime, because it can be changed into another prime (65608801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32804445 + 32804446.

It is an arithmetic number, because the mean of its divisors is an integer number (32804446).

Almost surely, 2^65608891 is an apocalyptic number.

65608891 is a deficient number, since it is larger than the sum of its proper divisors (1).

65608891 is an equidigital number, since it uses as much as digits as its factorization.

65608891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 65608891 is about 8099.9315429206. The cubic root of 65608891 is about 403.3241547138.

It can be divided in two parts, 6560 and 8891, that added together give a palindrome (15451).

The spelling of 65608891 in words is "sixty-five million, six hundred eight thousand, eight hundred ninety-one".