64455997391 has 2 divisors, whose sum is σ = 64455997392. Its totient is φ = 64455997390.

The previous prime is 64455997373. The next prime is 64455997427. The reversal of 64455997391 is 19379955446.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64455997391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64455996391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32227998695 + 32227998696.

It is an arithmetic number, because the mean of its divisors is an integer number (32227998696).

Almost surely, 2^64455997391 is an apocalyptic number.

64455997391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64455997391 is an equidigital number, since it uses as much as digits as its factorization.

64455997391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36741600, while the sum is 62.

The spelling of 64455997391 in words is "sixty-four billion, four hundred fifty-five million, nine hundred ninety-seven thousand, three hundred ninety-one".