1665224275968 has 768 divisors, whose sum is σ = 5676023808000. Its totient is φ = 477691084800.

The previous prime is 1665224275909. The next prime is 1665224275991. The reversal of 1665224275968 is 8695724225661.

1665224275968 is a `hidden beast` number, since 1 + 6 + 6 + 522 + 42 + 7 + 5 + 9 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 886228053 + ... + 886229931.

It is an arithmetic number, because the mean of its divisors is an integer number (7390656000).

Almost surely, 2^{1665224275968} is an apocalyptic number.

1665224275968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665224275968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2838011904000).

1665224275968 is an abundant number, since it is smaller than the sum of its proper divisors (4010799532032).

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

1665224275968 is a wasteful number, since it uses less digits than its factorization.

1665224275968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999 (or 1973 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 1665224275968 in words is "one trillion, six hundred sixty-five billion, two hundred twenty-four million, two hundred seventy-five thousand, nine hundred sixty-eight".