1664392960819 has 4 divisors (see below), whose sum is σ = 1679662621120. Its totient is φ = 1649123300520.

The previous prime is 1664392960801. The next prime is 1664392960871. The reversal of 1664392960819 is 9180692934661.

It is a happy number.

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 1664392960819 - 2⁷ = 1664392960691 is a prime.

It is a super-2 number, since 2×1664392960819² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664392960019) 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, 7634829987 + ... + 7634830204.

It is an arithmetic number, because the mean of its divisors is an integer number (419915655280).

Almost surely, 2^{1664392960819} is an apocalyptic number.

1664392960819 is a deficient number, since it is larger than the sum of its proper divisors (15269660301).

1664392960819 is a wasteful number, since it uses less digits than its factorization.

1664392960819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15269660300.

The product of its (nonzero) digits is 30233088, while the sum is 64.

The spelling of 1664392960819 in words is "one trillion, six hundred sixty-four billion, three hundred ninety-two million, nine hundred sixty thousand, eight hundred nineteen".