64671076565 has 4 divisors (see below), whose sum is σ = 77605291884. Its totient is φ = 51736861248.

The previous prime is 64671076559. The next prime is 64671076577. The reversal of 64671076565 is 56567017646.

64671076565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 48965723524 + 15705353041 = 221282^2 + 125321^2 .

It is a cyclic number.

It is not a de Polignac number, because 64671076565 - 2¹⁰ = 64671075541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6467107652 + ... + 6467107661.

It is an arithmetic number, because the mean of its divisors is an integer number (19401322971).

Almost surely, 2^64671076565 is an apocalyptic number.

It is an amenable number.

64671076565 is a deficient number, since it is larger than the sum of its proper divisors (12934215319).

64671076565 is a wasteful number, since it uses less digits than its factorization.

64671076565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12934215318.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 64671076565 in words is "sixty-four billion, six hundred seventy-one million, seventy-six thousand, five hundred sixty-five".