1981925098559 has 48 divisors (see below), whose sum is σ = 2448912384576. Its totient is φ = 1593768960000.

The previous prime is 1981925098541. The next prime is 1981925098561. The reversal of 1981925098559 is 9558905291891.

It is not a de Polignac number, because 1981925098559 - 2³⁶ = 1913205621823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1981925098492 and 1981925098501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981925098579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 660420059 + ... + 660423059.

It is an arithmetic number, because the mean of its divisors is an integer number (51019008012).

Almost surely, 2^{1981925098559} is an apocalyptic number.

1981925098559 is a deficient number, since it is larger than the sum of its proper divisors (466987286017).

1981925098559 is a wasteful number, since it uses less digits than its factorization.

1981925098559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5296 (or 5289 counting only the distinct ones).

The product of its (nonzero) digits is 104976000, while the sum is 71.

The spelling of 1981925098559 in words is "one trillion, nine hundred eighty-one billion, nine hundred twenty-five million, ninety-eight thousand, five hundred fifty-nine".