1981569572928 has 196 divisors, whose sum is σ = 6431531173488. Its totient is φ = 600475472640.

The previous prime is 1981569572909. The next prime is 1981569572959. The reversal of 1981569572928 is 8292759651891.

1981569572928 is a `hidden beast` number, since 1 + 9 + 8 + 1 + 569 + 57 + 2 + 9 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1417326 + ... + 2443757.

Almost surely, 2^{1981569572928} is an apocalyptic number.

1981569572928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1981569572928 is an abundant number, since it is smaller than the sum of its proper divisors (4449961600560).

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

1981569572928 is an equidigital number, since it uses as much as digits as its factorization.

1981569572928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3861124 (or 3861099 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 72.

The spelling of 1981569572928 in words is "one trillion, nine hundred eighty-one billion, five hundred sixty-nine million, five hundred seventy-two thousand, nine hundred twenty-eight".