1664575863 has 4 divisors (see below), whose sum is σ = 2219434488. Its totient is φ = 1109717240.

The previous prime is 1664575841. The next prime is 1664575867. The reversal of 1664575863 is 3685754661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3685754661 = 3 ⋅1228584887.

It is a cyclic number.

It is not a de Polignac number, because 1664575863 - 2¹² = 1664571767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664575867) 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, 277429308 + ... + 277429313.

It is an arithmetic number, because the mean of its divisors is an integer number (554858622).

Almost surely, 2^1664575863 is an apocalyptic number.

1664575863 is a deficient number, since it is larger than the sum of its proper divisors (554858625).

1664575863 is an equidigital number, since it uses as much as digits as its factorization.

1664575863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554858624.

The product of its digits is 3628800, while the sum is 51.

The square root of 1664575863 is about 40799.2139997819. The cubic root of 1664575863 is about 1185.1351096637.

The spelling of 1664575863 in words is "one billion, six hundred sixty-four million, five hundred seventy-five thousand, eight hundred sixty-three".