79121679533 has 24 divisors (see below), whose sum is σ = 91081733400. Its totient is φ = 68241882240.

The previous prime is 79121679523. The next prime is 79121679589. The reversal of 79121679533 is 33597612197.

It can be written as a sum of positive squares in 4 ways, for example, as 3120563044 + 76001116489 = 55862^2 + 275683^2 .

It is not a de Polignac number, because 79121679533 - 2⁴ = 79121679517 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 (79121679523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 253103 + ... + 471491.

It is an arithmetic number, because the mean of its divisors is an integer number (3795072225).

Almost surely, 2^79121679533 is an apocalyptic number.

It is an amenable number.

79121679533 is a deficient number, since it is larger than the sum of its proper divisors (11960053867).

79121679533 is a wasteful number, since it uses less digits than its factorization.

79121679533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218493 (or 218462 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 53.

The spelling of 79121679533 in words is "seventy-nine billion, one hundred twenty-one million, six hundred seventy-nine thousand, five hundred thirty-three".