79920823779 has 12 divisors (see below), whose sum is σ = 117333669232. Its totient is φ = 52407097200.

The previous prime is 79920823777. The next prime is 79920823789. The reversal of 79920823779 is 97732802997.

It is not a de Polignac number, because 79920823779 - 2¹ = 79920823777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79920823777) 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 11 ways as a sum of consecutive naturals, for example, 72787087 + ... + 72788184.

Almost surely, 2^79920823779 is an apocalyptic number.

79920823779 is a deficient number, since it is larger than the sum of its proper divisors (37412845453).

79920823779 is a wasteful number, since it uses less digits than its factorization.

79920823779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145575338 (or 145575335 counting only the distinct ones).

The product of its (nonzero) digits is 24004512, while the sum is 63.

The spelling of 79920823779 in words is "seventy-nine billion, nine hundred twenty million, eight hundred twenty-three thousand, seven hundred seventy-nine".