7999999189605 has 54 divisors (see below), whose sum is σ = 14169557527398. Its totient is φ = 4175420614560.

The previous prime is 7999999189561. The next prime is 7999999189627. The reversal of 7999999189605 is 5069819999997.

It can be written as a sum of positive squares in only one way, i.e., 6399999351684 + 1599999837921 = 2529822^2 + 1264911^2 .

It is not a de Polignac number, because 7999999189605 - 2⁶ = 7999999189541 is a prime.

It is a congruent number.

It is an unprimeable number.

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 53 ways as a sum of consecutive naturals, for example, 891757770 + ... + 891766740.

Almost surely, 2^{7999999189605} is an apocalyptic number.

It is an amenable number.

7999999189605 is a deficient number, since it is larger than the sum of its proper divisors (6169558337793).

7999999189605 is an frugal number, since it uses more digits than its factorization.

7999999189605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18047 (or 9026 counting only the distinct ones).

The product of its (nonzero) digits is 8035387920, while the sum is 90.

The spelling of 7999999189605 in words is "seven trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, one hundred eighty-nine thousand, six hundred five".