1664386813699 has 4 divisors (see below), whose sum is σ = 1664505432936. Its totient is φ = 1664268194464.

The previous prime is 1664386813697. The next prime is 1664386813709. The reversal of 1664386813699 is 9963186834661.

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 1664386813699 - 2¹ = 1664386813697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664386813697) 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 3 ways as a sum of consecutive naturals, for example, 59288569 + ... + 59316634.

It is an arithmetic number, because the mean of its divisors is an integer number (416126358234).

Almost surely, 2^{1664386813699} is an apocalyptic number.

1664386813699 is a deficient number, since it is larger than the sum of its proper divisors (118619237).

1664386813699 is a wasteful number, since it uses less digits than its factorization.

1664386813699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118619236.

The product of its digits is 241864704, while the sum is 70.

The spelling of 1664386813699 in words is "one trillion, six hundred sixty-four billion, three hundred eighty-six million, eight hundred thirteen thousand, six hundred ninety-nine".