64715879509 has 4 divisors (see below), whose sum is σ = 64721826016. Its totient is φ = 64709933004.

The previous prime is 64715879507. The next prime is 64715879533. The reversal of 64715879509 is 90597851746.

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 64715879509 - 2¹ = 64715879507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64715879507) 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, 2956899 + ... + 2978704.

It is an arithmetic number, because the mean of its divisors is an integer number (16180456504).

Almost surely, 2^64715879509 is an apocalyptic number.

It is an amenable number.

64715879509 is a deficient number, since it is larger than the sum of its proper divisors (5946507).

64715879509 is a wasteful number, since it uses less digits than its factorization.

64715879509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946506.

The product of its (nonzero) digits is 19051200, while the sum is 61.

The spelling of 64715879509 in words is "sixty-four billion, seven hundred fifteen million, eight hundred seventy-nine thousand, five hundred nine".