2166320640000 has 520 divisors, whose sum is σ = 7874354549952. Its totient is φ = 525148160000.

The previous prime is 2166320639993. The next prime is 2166320640023. The reversal of 2166320640000 is 460236612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 2166320640000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 84467179 + ... + 84492821.

Almost surely, 2^{2166320640000} is an apocalyptic number.

2166320640000 is a gapful number since it is divisible by the number (20) 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 2166320640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3937177274976).

2166320640000 is an abundant number, since it is smaller than the sum of its proper divisors (5708033909952).

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

2166320640000 is an equidigital number, since it uses as much as digits as its factorization.

2166320640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25701 (or 25664 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 2166320640000 its reverse (460236612), we get a palindrome (2166780876612).

The spelling of 2166320640000 in words is "two trillion, one hundred sixty-six billion, three hundred twenty million, six hundred forty thousand".