79807838505 has 16 divisors (see below), whose sum is σ = 128250156480. Its totient is φ = 42378308928.

The previous prime is 79807838503. The next prime is 79807838521. The reversal of 79807838505 is 50583870897.

It is not a de Polignac number, because 79807838505 - 2¹ = 79807838503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79807838501) 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 15 ways as a sum of consecutive naturals, for example, 11613427 + ... + 11620296.

It is an arithmetic number, because the mean of its divisors is an integer number (8015634780).

Almost surely, 2^79807838505 is an apocalyptic number.

It is an amenable number.

79807838505 is a deficient number, since it is larger than the sum of its proper divisors (48442317975).

79807838505 is a wasteful number, since it uses less digits than its factorization.

79807838505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23233960.

The product of its (nonzero) digits is 16934400, while the sum is 60.

The spelling of 79807838505 in words is "seventy-nine billion, eight hundred seven million, eight hundred thirty-eight thousand, five hundred five".