64367565565 has 16 divisors (see below), whose sum is σ = 77931495792. Its totient is φ = 51034998784.

The previous prime is 64367565541. The next prime is 64367565589. The reversal of 64367565565 is 56556576346.

It is an interprime number because it is at equal distance from previous prime (64367565541) and next prime (64367565589).

It can be written as a sum of positive squares in 8 ways, for example, as 18663111769 + 45704453796 = 136613^2 + 213786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64367565565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346497 + ... + 498793.

It is an arithmetic number, because the mean of its divisors is an integer number (4870718487).

Almost surely, 2^64367565565 is an apocalyptic number.

It is an amenable number.

64367565565 is a deficient number, since it is larger than the sum of its proper divisors (13563930227).

64367565565 is a wasteful number, since it uses less digits than its factorization.

64367565565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153056.

The product of its digits is 68040000, while the sum is 58.

The spelling of 64367565565 in words is "sixty-four billion, three hundred sixty-seven million, five hundred sixty-five thousand, five hundred sixty-five".