64647722774645 has 32 divisors (see below), whose sum is σ = 77814783889920. Its totient is φ = 51560147358720.

The previous prime is 64647722774627. The next prime is 64647722774647. The reversal of 64647722774645 is 54647722774646.

It is not a de Polignac number, because 64647722774645 - 2⁶ = 64647722774581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64647722774647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6679168916 + ... + 6679178594.

It is an arithmetic number, because the mean of its divisors is an integer number (2431711996560).

Almost surely, 2^{64647722774645} is an apocalyptic number.

It is an amenable number.

64647722774645 is a deficient number, since it is larger than the sum of its proper divisors (13167061115275).

64647722774645 is a wasteful number, since it uses less digits than its factorization.

64647722774645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13325.

The product of its digits is 2655313920, while the sum is 71.

Subtracting from 64647722774645 its reverse (54647722774646), we obtain a palindrome (9999999999999).

The spelling of 64647722774645 in words is "sixty-four trillion, six hundred forty-seven billion, seven hundred twenty-two million, seven hundred seventy-four thousand, six hundred forty-five".