1665165383232 has 224 divisors, whose sum is σ = 5288161737600. Its totient is φ = 456839626752.

The previous prime is 1665165383149. The next prime is 1665165383279. The reversal of 1665165383232 is 2323835615661.

It is a Harshad number since it is a multiple of its sum of digits (51).

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 31 ways as a sum of consecutive naturals, for example, 226507 + ... + 1838922.

It is an arithmetic number, because the mean of its divisors is an integer number (23607864900).

Almost surely, 2^{1665165383232} is an apocalyptic number.

1665165383232 is a gapful number since it is divisible by the number (12) 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 1665165383232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2644080868800).

1665165383232 is an abundant number, since it is smaller than the sum of its proper divisors (3622996354368).

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

1665165383232 is a wasteful number, since it uses less digits than its factorization.

1665165383232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065493 (or 2065483 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 51.

The spelling of 1665165383232 in words is "one trillion, six hundred sixty-five billion, one hundred sixty-five million, three hundred eighty-three thousand, two hundred thirty-two".