1664297365873 has 4 divisors (see below), whose sum is σ = 1664300616048. Its totient is φ = 1664294115700.

The previous prime is 1664297365837. The next prime is 1664297365877. The reversal of 1664297365873 is 3785637924661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1664297365873 - 2⁹ = 1664297365361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664297365799 and 1664297365808.

It is not an unprimeable number, because it can be changed into a prime (1664297365877) 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, 669811 + ... + 1943512.

It is an arithmetic number, because the mean of its divisors is an integer number (416075154012).

Almost surely, 2^{1664297365873} is an apocalyptic number.

It is an amenable number.

1664297365873 is a deficient number, since it is larger than the sum of its proper divisors (3250175).

1664297365873 is an equidigital number, since it uses as much as digits as its factorization.

1664297365873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250174.

The product of its digits is 274337280, while the sum is 67.

The spelling of 1664297365873 in words is "one trillion, six hundred sixty-four billion, two hundred ninety-seven million, three hundred sixty-five thousand, eight hundred seventy-three".