64520040569 has 2 divisors, whose sum is σ = 64520040570. Its totient is φ = 64520040568.

The previous prime is 64520040479. The next prime is 64520040659. The reversal of 64520040569 is 96504002546.

It is a happy number.

64520040569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (64520040659) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (64520040479) and next prime (64520040659).

It can be written as a sum of positive squares in only one way, i.e., 55147477225 + 9372563344 = 234835^2 + 96812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64520040569 is a prime.

It is a super-2 number, since 2×64520040569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64520040269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32260020284 + 32260020285.

It is an arithmetic number, because the mean of its divisors is an integer number (32260020285).

Almost surely, 2^64520040569 is an apocalyptic number.

It is an amenable number.

64520040569 is a deficient number, since it is larger than the sum of its proper divisors (1).

64520040569 is an equidigital number, since it uses as much as digits as its factorization.

64520040569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 64520040569 in words is "sixty-four billion, five hundred twenty million, forty thousand, five hundred sixty-nine".