64952777665 has 4 divisors (see below), whose sum is σ = 77943333204. Its totient is φ = 51962222128.

The previous prime is 64952777663. The next prime is 64952777677. The reversal of 64952777665 is 56677725946.

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 28795374864 + 36157402801 = 169692^2 + 190151^2 .

It is a cyclic number.

It is not a de Polignac number, because 64952777665 - 2¹ = 64952777663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64952777597 and 64952777606.

It is not an unprimeable number, because it can be changed into a prime (64952777663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6495277762 + ... + 6495277771.

It is an arithmetic number, because the mean of its divisors is an integer number (19485833301).

Almost surely, 2^64952777665 is an apocalyptic number.

It is an amenable number.

64952777665 is a deficient number, since it is larger than the sum of its proper divisors (12990555539).

64952777665 is a wasteful number, since it uses less digits than its factorization.

64952777665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990555538.

The product of its digits is 133358400, while the sum is 64.

The spelling of 64952777665 in words is "sixty-four billion, nine hundred fifty-two million, seven hundred seventy-seven thousand, six hundred sixty-five".