64964426773 has 4 divisors (see below), whose sum is σ = 68785863660. Its totient is φ = 61142989888.

The previous prime is 64964426759. The next prime is 64964426777. The reversal of 64964426773 is 37762446946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26895344004 + 38069082769 = 163998^2 + 195113^2 .

It is not a de Polignac number, because 64964426773 - 2¹⁷ = 64964295701 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64964426777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1910718418 + ... + 1910718451.

It is an arithmetic number, because the mean of its divisors is an integer number (17196465915).

Almost surely, 2^64964426773 is an apocalyptic number.

It is an amenable number.

64964426773 is a deficient number, since it is larger than the sum of its proper divisors (3821436887).

64964426773 is a wasteful number, since it uses less digits than its factorization.

64964426773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821436886.

The product of its digits is 36578304, while the sum is 58.

The spelling of 64964426773 in words is "sixty-four billion, nine hundred sixty-four million, four hundred twenty-six thousand, seven hundred seventy-three".