64333720897 has 2 divisors, whose sum is σ = 64333720898. Its totient is φ = 64333720896.

The previous prime is 64333720883. The next prime is 64333720903. The reversal of 64333720897 is 79802733346.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36423340801 + 27910380096 = 190849^2 + 167064^2 .

It is a cyclic number.

It is not a de Polignac number, because 64333720897 - 2⁷ = 64333720769 is a prime.

It is not a weakly prime, because it can be changed into another prime (64333730897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32166860448 + 32166860449.

It is an arithmetic number, because the mean of its divisors is an integer number (32166860449).

Almost surely, 2^64333720897 is an apocalyptic number.

It is an amenable number.

64333720897 is a deficient number, since it is larger than the sum of its proper divisors (1).

64333720897 is an equidigital number, since it uses as much as digits as its factorization.

64333720897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 52.

The spelling of 64333720897 in words is "sixty-four billion, three hundred thirty-three million, seven hundred twenty thousand, eight hundred ninety-seven".