1866665533824 has 1536 divisors, whose sum is σ = 7181446272000. Its totient is φ = 479322095616.

The previous prime is 1866665533823. The next prime is 1866665533829. The reversal of 1866665533824 is 4283355666681.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866665533823) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 5963787492 + ... + 5963787804.

It is an arithmetic number, because the mean of its divisors is an integer number (4675420750).

Almost surely, 2^{1866665533824} is an apocalyptic number.

1866665533824 is a gapful number since it is divisible by the number (14) 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 1866665533824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3590723136000).

1866665533824 is an abundant number, since it is smaller than the sum of its proper divisors (5314780738176).

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

1866665533824 is an equidigital number, since it uses as much as digits as its factorization.

1866665533824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 381 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 63.

The spelling of 1866665533824 in words is "one trillion, eight hundred sixty-six billion, six hundred sixty-five million, five hundred thirty-three thousand, eight hundred twenty-four".