7666436439899 has 4 divisors (see below), whose sum is σ = 7666458765000. Its totient is φ = 7666414114800.

The previous prime is 7666436439869. The next prime is 7666436439911. The reversal of 7666436439899 is 9989346346667.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7666436439899 - 2²⁰ = 7666435391323 is a prime.

It is a super-2 number, since 2×7666436439899² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7666436439859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10639274 + ... + 11336975.

It is an arithmetic number, because the mean of its divisors is an integer number (1916614691250).

Almost surely, 2^{7666436439899} is an apocalyptic number.

7666436439899 is a deficient number, since it is larger than the sum of its proper divisors (22325101).

7666436439899 is a wasteful number, since it uses less digits than its factorization.

7666436439899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22325100.

The product of its digits is 7618738176, while the sum is 80.

The spelling of 7666436439899 in words is "seven trillion, six hundred sixty-six billion, four hundred thirty-six million, four hundred thirty-nine thousand, eight hundred ninety-nine".