64640063357 has 2 divisors, whose sum is σ = 64640063358. Its totient is φ = 64640063356.

The previous prime is 64640063297. The next prime is 64640063399. The reversal of 64640063357 is 75336004646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64336293316 + 303770041 = 253646^2 + 17429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64640063357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64640263357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320031678 + 32320031679.

It is an arithmetic number, because the mean of its divisors is an integer number (32320031679).

Almost surely, 2^64640063357 is an apocalyptic number.

It is an amenable number.

64640063357 is a deficient number, since it is larger than the sum of its proper divisors (1).

64640063357 is an equidigital number, since it uses as much as digits as its factorization.

64640063357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 44.

The spelling of 64640063357 in words is "sixty-four billion, six hundred forty million, sixty-three thousand, three hundred fifty-seven".