65156056591 has 2 divisors, whose sum is σ = 65156056592. Its totient is φ = 65156056590.

The previous prime is 65156056579. The next prime is 65156056597. The reversal of 65156056591 is 19565065156.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65156056591 - 2²³ = 65147667983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65156056597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32578028295 + 32578028296.

It is an arithmetic number, because the mean of its divisors is an integer number (32578028296).

Almost surely, 2^65156056591 is an apocalyptic number.

65156056591 is a deficient number, since it is larger than the sum of its proper divisors (1).

65156056591 is an equidigital number, since it uses as much as digits as its factorization.

65156056591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215000, while the sum is 49.

The spelling of 65156056591 in words is "sixty-five billion, one hundred fifty-six million, fifty-six thousand, five hundred ninety-one".