79421079802 has 4 divisors (see below), whose sum is σ = 119131619706. Its totient is φ = 39710539900.

The previous prime is 79421079799. The next prime is 79421079811. The reversal of 79421079802 is 20897012497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20897012497 = 19 ⋅1099842763.

It can be written as a sum of positive squares in only one way, i.e., 67516305921 + 11904773881 = 259839^2 + 109109^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19855269949 + ... + 19855269952.

Almost surely, 2^79421079802 is an apocalyptic number.

79421079802 is a deficient number, since it is larger than the sum of its proper divisors (39710539904).

79421079802 is a wasteful number, since it uses less digits than its factorization.

79421079802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39710539903.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 79421079802 in words is "seventy-nine billion, four hundred twenty-one million, seventy-nine thousand, eight hundred two".