79845439851 has 12 divisors (see below), whose sum is σ = 119603869112. Its totient is φ = 53230293072.

The previous prime is 79845439837. The next prime is 79845439859. The reversal of 79845439851 is 15893454897.

79845439851 is a `hidden beast` number, since 7 + 9 + 8 + 4 + 543 + 9 + 85 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-79845439851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79845439859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164290786 + ... + 164291271.

Almost surely, 2^79845439851 is an apocalyptic number.

79845439851 is a deficient number, since it is larger than the sum of its proper divisors (39758429261).

79845439851 is an equidigital number, since it uses as much as digits as its factorization.

79845439851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328582072 (or 328582060 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 63.

The spelling of 79845439851 in words is "seventy-nine billion, eight hundred forty-five million, four hundred thirty-nine thousand, eight hundred fifty-one".