64716443513 has 4 divisors (see below), whose sum is σ = 64765960080. Its totient is φ = 64666926948.

The previous prime is 64716443509. The next prime is 64716443527. The reversal of 64716443513 is 31534461746.

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 64716443513 - 2² = 64716443509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64716443593) 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, 24756323 + ... + 24758936.

It is an arithmetic number, because the mean of its divisors is an integer number (16191490020).

Almost surely, 2^64716443513 is an apocalyptic number.

It is an amenable number.

64716443513 is a deficient number, since it is larger than the sum of its proper divisors (49516567).

64716443513 is a wasteful number, since it uses less digits than its factorization.

64716443513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49516566.

The product of its digits is 725760, while the sum is 44.

The spelling of 64716443513 in words is "sixty-four billion, seven hundred sixteen million, four hundred forty-three thousand, five hundred thirteen".