1980398581776 has 60 divisors (see below), whose sum is σ = 5834068929520. Its totient is φ = 625389024960.

The previous prime is 1980398581771. The next prime is 1980398581793. The reversal of 1980398581776 is 6771858930891.

1980398581776 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 39 + 8 + 581 + 7 + 7 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1980398581771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 361912210 + ... + 361917681.

Almost surely, 2^{1980398581776} is an apocalyptic number.

1980398581776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1980398581776 is an abundant number, since it is smaller than the sum of its proper divisors (3853670347744).

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

1980398581776 is a wasteful number, since it uses less digits than its factorization.

1980398581776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723829924 (or 723829915 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 72.

The spelling of 1980398581776 in words is "one trillion, nine hundred eighty billion, three hundred ninety-eight million, five hundred eighty-one thousand, seven hundred seventy-six".