65580091 has 2 divisors, whose sum is σ = 65580092. Its totient is φ = 65580090.

The previous prime is 65580083. The next prime is 65580113. The reversal of 65580091 is 19008556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65580091 - 2³ = 65580083 is a prime.

It is not a weakly prime, because it can be changed into another prime (65586091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32790045 + 32790046.

It is an arithmetic number, because the mean of its divisors is an integer number (32790046).

Almost surely, 2^65580091 is an apocalyptic number.

65580091 is a deficient number, since it is larger than the sum of its proper divisors (1).

65580091 is an equidigital number, since it uses as much as digits as its factorization.

65580091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 65580091 is about 8098.1535549778. The cubic root of 65580091 is about 403.2651310280.

The spelling of 65580091 in words is "sixty-five million, five hundred eighty thousand, ninety-one".