64520040269 has 2 divisors, whose sum is σ = 64520040270. Its totient is φ = 64520040268.

The previous prime is 64520040209. The next prime is 64520040271. The reversal of 64520040269 is 96204002546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61423674244 + 3096366025 = 247838^2 + 55645^2 .

It is a cyclic number.

It is not a de Polignac number, because 64520040269 - 2²⁴ = 64503263053 is a prime.

It is a super-2 number, since 2×64520040269² (a number of 22 digits) contains 22 as substring.

Together with 64520040271, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64520040209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32260020134 + 32260020135.

It is an arithmetic number, because the mean of its divisors is an integer number (32260020135).

Almost surely, 2^64520040269 is an apocalyptic number.

It is an amenable number.

64520040269 is a deficient number, since it is larger than the sum of its proper divisors (1).

64520040269 is an equidigital number, since it uses as much as digits as its factorization.

64520040269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 64520040269 in words is "sixty-four billion, five hundred twenty million, forty thousand, two hundred sixty-nine".