65220691 has 2 divisors, whose sum is σ = 65220692. Its totient is φ = 65220690.

The previous prime is 65220679. The next prime is 65220697. The reversal of 65220691 is 19602256.

65220691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65220691 - 2⁷ = 65220563 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65220697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32610345 + 32610346.

It is an arithmetic number, because the mean of its divisors is an integer number (32610346).

Almost surely, 2^65220691 is an apocalyptic number.

65220691 is a deficient number, since it is larger than the sum of its proper divisors (1).

65220691 is an equidigital number, since it uses as much as digits as its factorization.

65220691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 65220691 is about 8075.9328253769. The cubic root of 65220691 is about 402.5271069536.

The spelling of 65220691 in words is "sixty-five million, two hundred twenty thousand, six hundred ninety-one".