79683712649 has 4 divisors (see below), whose sum is σ = 79745532180. Its totient is φ = 79621893120.

The previous prime is 79683712637. The next prime is 79683712657. The reversal of 79683712649 is 94621738697.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41044734025 + 38638978624 = 202595^2 + 196568^2 .

It is a cyclic number.

It is not a de Polignac number, because 79683712649 - 2¹² = 79683708553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79683712591 and 79683712600.

It is not an unprimeable number, because it can be changed into a prime (79683711649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30907832 + ... + 30910409.

It is an arithmetic number, because the mean of its divisors is an integer number (19936383045).

Almost surely, 2^79683712649 is an apocalyptic number.

It is an amenable number.

79683712649 is a deficient number, since it is larger than the sum of its proper divisors (61819531).

79683712649 is a wasteful number, since it uses less digits than its factorization.

79683712649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61819530.

The product of its digits is 27433728, while the sum is 62.

The spelling of 79683712649 in words is "seventy-nine billion, six hundred eighty-three million, seven hundred twelve thousand, six hundred forty-nine".