79366521643 has 4 divisors (see below), whose sum is σ = 80484360048. Its totient is φ = 78248683240.

The previous prime is 79366521601. The next prime is 79366521649. The reversal of 79366521643 is 34612566397.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34612566397 = 331 ⋅104569687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79366521643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79366521649) 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, 558919096 + ... + 558919237.

It is an arithmetic number, because the mean of its divisors is an integer number (20121090012).

Almost surely, 2^79366521643 is an apocalyptic number.

79366521643 is a deficient number, since it is larger than the sum of its proper divisors (1117838405).

79366521643 is a wasteful number, since it uses less digits than its factorization.

79366521643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117838404.

The product of its digits is 4898880, while the sum is 52.

The spelling of 79366521643 in words is "seventy-nine billion, three hundred sixty-six million, five hundred twenty-one thousand, six hundred forty-three".