1665337378432 has 384 divisors, whose sum is σ = 4250740982400. Its totient is φ = 635835432960.

The previous prime is 1665337378417. The next prime is 1665337378477. The reversal of 1665337378432 is 2348737335661.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 733950994 + ... + 733953262.

It is an arithmetic number, because the mean of its divisors is an integer number (11069637975).

Almost surely, 2^{1665337378432} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665337378432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2125370491200).

1665337378432 is an abundant number, since it is smaller than the sum of its proper divisors (2585403603968).

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

1665337378432 is a wasteful number, since it uses less digits than its factorization.

1665337378432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484 (or 2459 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 58.

The spelling of 1665337378432 in words is "one trillion, six hundred sixty-five billion, three hundred thirty-seven million, three hundred seventy-eight thousand, four hundred thirty-two".