64637300993 has 2 divisors, whose sum is σ = 64637300994. Its totient is φ = 64637300992.

The previous prime is 64637300983. The next prime is 64637300999. The reversal of 64637300993 is 39900373646.

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., 64341873649 + 295427344 = 253657^2 + 17188^2 .

It is a cyclic number.

It is not a de Polignac number, because 64637300993 - 2⁶ = 64637300929 is a prime.

It is not a weakly prime, because it can be changed into another prime (64637300999) 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, 32318650496 + 32318650497.

It is an arithmetic number, because the mean of its divisors is an integer number (32318650497).

Almost surely, 2^64637300993 is an apocalyptic number.

It is an amenable number.

64637300993 is a deficient number, since it is larger than the sum of its proper divisors (1).

64637300993 is an equidigital number, since it uses as much as digits as its factorization.

64637300993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 50.

The spelling of 64637300993 in words is "sixty-four billion, six hundred thirty-seven million, three hundred thousand, nine hundred ninety-three".