64653791 has 2 divisors, whose sum is σ = 64653792. Its totient is φ = 64653790.

The previous prime is 64653781. The next prime is 64653803. The reversal of 64653791 is 19735646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64653791 is a prime.

It is a super-2 number, since 2×64653791² = 8360225381343362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64653781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32326895 + 32326896.

It is an arithmetic number, because the mean of its divisors is an integer number (32326896).

Almost surely, 2^64653791 is an apocalyptic number.

64653791 is a deficient number, since it is larger than the sum of its proper divisors (1).

64653791 is an equidigital number, since it uses as much as digits as its factorization.

64653791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 64653791 is about 8040.7581110241. The cubic root of 64653791 is about 401.3574526778.

The spelling of 64653791 in words is "sixty-four million, six hundred fifty-three thousand, seven hundred ninety-one".