79434420646789 has 32 divisors (see below), whose sum is σ = 90520239368160. Its totient is φ = 69209789755392.

The previous prime is 79434420646783. The next prime is 79434420646811. The reversal of 79434420646789 is 98764602443497.

It can be written as a sum of positive squares in 16 ways, for example, as 6506748993889 + 72927671652900 = 2550833^2 + 8539770^2 .

It is a de Polignac number, because none of the positive numbers 2^k-79434420646789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79434420646783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15236352 + ... + 19774105.

It is an arithmetic number, because the mean of its divisors is an integer number (2828757480255).

Almost surely, 2^{79434420646789} is an apocalyptic number.

It is an amenable number.

79434420646789 is a deficient number, since it is larger than the sum of its proper divisors (11085818721371).

79434420646789 is a wasteful number, since it uses less digits than its factorization.

79434420646789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35010649.

The product of its (nonzero) digits is 1755758592, while the sum is 73.

The spelling of 79434420646789 in words is "seventy-nine trillion, four hundred thirty-four billion, four hundred twenty million, six hundred forty-six thousand, seven hundred eighty-nine".