1980384065946 has 256 divisors, whose sum is σ = 5354268917760. Its totient is φ = 534351168000.

The previous prime is 1980384065917. The next prime is 1980384065963. The reversal of 1980384065946 is 6495604830891.

1980384065946 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 38 + 4 + 0 + 6 + 594 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 74913351 + ... + 74939781.

It is an arithmetic number, because the mean of its divisors is an integer number (20915112960).

Almost surely, 2^{1980384065946} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980384065946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2677134458880).

1980384065946 is an abundant number, since it is smaller than the sum of its proper divisors (3373884851814).

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

1980384065946 is a wasteful number, since it uses less digits than its factorization.

1980384065946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26810 (or 26804 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 1980384065946 in words is "one trillion, nine hundred eighty billion, three hundred eighty-four million, sixty-five thousand, nine hundred forty-six".