64520040499 has 4 divisors (see below), whose sum is σ = 66601332160. Its totient is φ = 62438748840.

The previous prime is 64520040479. The next prime is 64520040569. The reversal of 64520040499 is 99404002546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99404002546 = 2 ⋅49702001273.

It is a cyclic number.

It is not a de Polignac number, because 64520040499 - 2¹⁵ = 64520007731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64520040479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040645784 + ... + 1040645845.

It is an arithmetic number, because the mean of its divisors is an integer number (16650333040).

Almost surely, 2^64520040499 is an apocalyptic number.

64520040499 is a deficient number, since it is larger than the sum of its proper divisors (2081291661).

64520040499 is a wasteful number, since it uses less digits than its factorization.

64520040499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081291660.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 64520040499 in words is "sixty-four billion, five hundred twenty million, forty thousand, four hundred ninety-nine".