64647722774647 has 2 divisors, whose sum is σ = 64647722774648. Its totient is φ = 64647722774646.

The previous prime is 64647722774627. The next prime is 64647722774653. The reversal of 64647722774647 is 74647722774646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64647722774647 - 2³¹ = 64645575290999 is a prime.

It is a super-2 number, since 2×64647722774647² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64647722774647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64647722774627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32323861387323 + 32323861387324.

It is an arithmetic number, because the mean of its divisors is an integer number (32323861387324).

Almost surely, 2^{64647722774647} is an apocalyptic number.

64647722774647 is a deficient number, since it is larger than the sum of its proper divisors (1).

64647722774647 is an equidigital number, since it uses as much as digits as its factorization.

64647722774647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3717439488, while the sum is 73.

Subtracting 64647722774647 from its reverse (74647722774646), we obtain a palindrome (9999999999999).

The spelling of 64647722774647 in words is "sixty-four trillion, six hundred forty-seven billion, seven hundred twenty-two million, seven hundred seventy-four thousand, six hundred forty-seven".