64924568809 has 3 divisors (see below), whose sum is σ = 64924823613. Its totient is φ = 64924314006.

The previous prime is 64924568801. The next prime is 64924568867. The reversal of 64924568809 is 90886542946.

The square root of 64924568809 is 254803.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 64924568809 - 2³ = 64924568801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64924568801) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 127402 + ... + 382204.

It is an arithmetic number, because the mean of its divisors is an integer number (21641607871).

Almost surely, 2^64924568809 is an apocalyptic number.

64924568809 is the 254803-rd square number.

64924568809 is the 127402-nd centered octagonal number.

It is an amenable number.

64924568809 is a deficient number, since it is larger than the sum of its proper divisors (254804).

64924568809 is an frugal number, since it uses more digits than its factorization.

64924568809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509606 (or 254803 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 61.

The spelling of 64924568809 in words is "sixty-four billion, nine hundred twenty-four million, five hundred sixty-eight thousand, eight hundred nine".