64820799679 has 4 divisors (see below), whose sum is σ = 64828677384. Its totient is φ = 64812921976.

The previous prime is 64820799671. The next prime is 64820799683. The reversal of 64820799679 is 97699702846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64820799679 - 2³ = 64820799671 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64820799671) 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, 3926497 + ... + 3942970.

It is an arithmetic number, because the mean of its divisors is an integer number (16207169346).

Almost surely, 2^64820799679 is an apocalyptic number.

64820799679 is a deficient number, since it is larger than the sum of its proper divisors (7877705).

64820799679 is an equidigital number, since it uses as much as digits as its factorization.

64820799679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7877704.

The product of its (nonzero) digits is 82301184, while the sum is 67.

The spelling of 64820799679 in words is "sixty-four billion, eight hundred twenty million, seven hundred ninety-nine thousand, six hundred seventy-nine".