1664093287 has 4 divisors (see below), whose sum is σ = 1664435560. Its totient is φ = 1663751016.

The previous prime is 1664093273. The next prime is 1664093303. The reversal of 1664093287 is 7823904661.

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 1664093287 - 2¹⁹ = 1663568999 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664093267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163737 + ... + 173602.

It is an arithmetic number, because the mean of its divisors is an integer number (416108890).

Almost surely, 2^1664093287 is an apocalyptic number.

1664093287 is a deficient number, since it is larger than the sum of its proper divisors (342273).

1664093287 is an equidigital number, since it uses as much as digits as its factorization.

1664093287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342272.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 1664093287 is about 40793.2995355855. The cubic root of 1664093287 is about 1185.0205713699.

The spelling of 1664093287 in words is "one billion, six hundred sixty-four million, ninety-three thousand, two hundred eighty-seven".