1981938585624 has 32 divisors (see below), whose sum is σ = 4955642286000. Its totient is φ = 660540085632.

The previous prime is 1981938585617. The next prime is 1981938585629. The reversal of 1981938585624 is 4265858391891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981938585629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6479239 + ... + 6778230.

Almost surely, 2^{1981938585624} is an apocalyptic number.

It is an amenable number.

1981938585624 is an abundant number, since it is smaller than the sum of its proper divisors (2973703700376).

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

1981938585624 is a wasteful number, since it uses less digits than its factorization.

1981938585624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13263707 (or 13263703 counting only the distinct ones).

The product of its digits is 149299200, while the sum is 69.

The spelling of 1981938585624 in words is "one trillion, nine hundred eighty-one billion, nine hundred thirty-eight million, five hundred eighty-five thousand, six hundred twenty-four".