1665664005888 has 108 divisors (see below), whose sum is σ = 4825282127848. Its totient is φ = 552589793280.

The previous prime is 1665664005869. The next prime is 1665664005917. The reversal of 1665664005888 is 8885004665661.

1665664005888 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 6 + 6 + 40 + 0 + 588 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1226995 + ... + 2199282.

Almost surely, 2^{1665664005888} is an apocalyptic number.

1665664005888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1665664005888 is an abundant number, since it is smaller than the sum of its proper divisors (3159618121960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665664005888 is a wasteful number, since it uses less digits than its factorization.

1665664005888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426510 (or 3426493 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 1665664005888 in words is "one trillion, six hundred sixty-five billion, six hundred sixty-four million, five thousand, eight hundred eighty-eight".