64531359393 has 4 divisors (see below), whose sum is σ = 86041812528. Its totient is φ = 43020906260.

The previous prime is 64531359391. The next prime is 64531359413. The reversal of 64531359393 is 39395313546.

It is a happy number.

64531359393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64531359393 - 2¹ = 64531359391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64531359391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10755226563 + ... + 10755226568.

It is an arithmetic number, because the mean of its divisors is an integer number (21510453132).

Almost surely, 2^64531359393 is an apocalyptic number.

It is an amenable number.

64531359393 is a deficient number, since it is larger than the sum of its proper divisors (21510453135).

64531359393 is a wasteful number, since it uses less digits than its factorization.

64531359393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21510453134.

The product of its digits is 3936600, while the sum is 51.

The spelling of 64531359393 in words is "sixty-four billion, five hundred thirty-one million, three hundred fifty-nine thousand, three hundred ninety-three".