79881212689 has 8 divisors (see below), whose sum is σ = 81193104000. Its totient is φ = 78576839952.

The previous prime is 79881212687. The next prime is 79881212693. The reversal of 79881212689 is 98621218897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79881212689 - 2¹ = 79881212687 is a prime.

It is a super-2 number, since 2×79881212689² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79881212687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1858219 + ... + 1900720.

It is an arithmetic number, because the mean of its divisors is an integer number (10149138000).

Almost surely, 2^79881212689 is an apocalyptic number.

79881212689 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

79881212689 is a deficient number, since it is larger than the sum of its proper divisors (1311891311).

79881212689 is a wasteful number, since it uses less digits than its factorization.

79881212689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759287.

The product of its digits is 6967296, while the sum is 61.

The spelling of 79881212689 in words is "seventy-nine billion, eight hundred eighty-one million, two hundred twelve thousand, six hundred eighty-nine".