64964943771 has 24 divisors (see below), whose sum is σ = 108512876304. Its totient is φ = 34267222080.

The previous prime is 64964943751. The next prime is 64964943781. The reversal of 64964943771 is 17734946946.

It is not a de Polignac number, because 64964943771 - 2⁶ = 64964943707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64964943751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16995720 + ... + 16999541.

It is an arithmetic number, because the mean of its divisors is an integer number (4521369846).

Almost surely, 2^64964943771 is an apocalyptic number.

64964943771 is a deficient number, since it is larger than the sum of its proper divisors (43547932533).

64964943771 is a wasteful number, since it uses less digits than its factorization.

64964943771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33995291 (or 33995284 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 60.

The spelling of 64964943771 in words is "sixty-four billion, nine hundred sixty-four million, nine hundred forty-three thousand, seven hundred seventy-one".