1668822579899 has 4 divisors (see below), whose sum is σ = 1680828497880. Its totient is φ = 1656816661920.

The previous prime is 1668822579797. The next prime is 1668822579923. The reversal of 1668822579899 is 9989752288661.

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 1668822579899 - 2²⁰ = 1668821531323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668822576899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6002958782 + ... + 6002959059.

It is an arithmetic number, because the mean of its divisors is an integer number (420207124470).

Almost surely, 2^{1668822579899} is an apocalyptic number.

1668822579899 is a deficient number, since it is larger than the sum of its proper divisors (12005917981).

1668822579899 is a wasteful number, since it uses less digits than its factorization.

1668822579899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12005917980.

The product of its digits is 1881169920, while the sum is 80.

The spelling of 1668822579899 in words is "one trillion, six hundred sixty-eight billion, eight hundred twenty-two million, five hundred seventy-nine thousand, eight hundred ninety-nine".