64697639443 has 2 divisors, whose sum is σ = 64697639444. Its totient is φ = 64697639442.

The previous prime is 64697639401. The next prime is 64697639491. The reversal of 64697639443 is 34493679646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64697639443 is a prime.

It is not a weakly prime, because it can be changed into another prime (64697639543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32348819721 + 32348819722.

It is an arithmetic number, because the mean of its divisors is an integer number (32348819722).

Almost surely, 2^64697639443 is an apocalyptic number.

64697639443 is a deficient number, since it is larger than the sum of its proper divisors (1).

64697639443 is an equidigital number, since it uses as much as digits as its factorization.

64697639443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70543872, while the sum is 61.

The spelling of 64697639443 in words is "sixty-four billion, six hundred ninety-seven million, six hundred thirty-nine thousand, four hundred forty-three".