1980644691200 has 432 divisors, whose sum is σ = 5952738583680. Its totient is φ = 637925621760.

The previous prime is 1980644691083. The next prime is 1980644691211. The reversal of 1980644691200 is 21964460891.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

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, 48049799 + ... + 48091001.

Almost surely, 2^{1980644691200} is an apocalyptic number.

1980644691200 is a gapful number since it is divisible by the number (10) 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 1980644691200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2976369291840).

1980644691200 is an abundant number, since it is smaller than the sum of its proper divisors (3972093892480).

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

1980644691200 is a wasteful number, since it uses less digits than its factorization.

1980644691200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41302 (or 41283 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 1980644691200 in words is "one trillion, nine hundred eighty billion, six hundred forty-four million, six hundred ninety-one thousand, two hundred".