7999860088881 has 40 divisors (see below), whose sum is σ = 11983536207720. Its totient is φ = 5318467112448.

The previous prime is 7999860088823. The next prime is 7999860088907. The reversal of 7999860088881 is 1888800689997.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3472412360481 + 4527447728400 = 1863441^2 + 2127780^2 .

It is not a de Polignac number, because 7999860088881 - 2¹⁴ = 7999860072497 is a prime.

It is a super-2 number, since 2×7999860088881² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 7999860088881.

It is not an unprimeable number, because it can be changed into a prime (7999860048881) 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 39 ways as a sum of consecutive naturals, for example, 77565015 + ... + 77668083.

It is an arithmetic number, because the mean of its divisors is an integer number (299588405193).

Almost surely, 2^{7999860088881} is an apocalyptic number.

It is an amenable number.

7999860088881 is a deficient number, since it is larger than the sum of its proper divisors (3983676118839).

7999860088881 is a wasteful number, since it uses less digits than its factorization.

7999860088881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105727 (or 105718 counting only the distinct ones).

The product of its (nonzero) digits is 1003290624, while the sum is 81.

The spelling of 7999860088881 in words is "seven trillion, nine hundred ninety-nine billion, eight hundred sixty million, eighty-eight thousand, eight hundred eighty-one".