1664382855 has 16 divisors (see below), whose sum is σ = 2674160640. Its totient is φ = 883954848.

The previous prime is 1664382829. The next prime is 1664382869. The reversal of 1664382855 is 5582834661.

It is a happy number.

It is not a de Polignac number, because 1664382855 - 2²⁰ = 1663334279 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228547 + ... + 235716.

It is an arithmetic number, because the mean of its divisors is an integer number (167135040).

Almost surely, 2^1664382855 is an apocalyptic number.

1664382855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664382855 is a deficient number, since it is larger than the sum of its proper divisors (1009777785).

1664382855 is a wasteful number, since it uses less digits than its factorization.

1664382855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464510.

The product of its digits is 1382400, while the sum is 48.

The square root of 1664382855 is about 40796.8485915273. The cubic root of 1664382855 is about 1185.0893023194.

The spelling of 1664382855 in words is "one billion, six hundred sixty-four million, three hundred eighty-two thousand, eight hundred fifty-five".