1980561989191 has 8 divisors (see below), whose sum is σ = 2131443761904. Its totient is φ = 1833500008320.

The previous prime is 1980561989183. The next prime is 1980561989201. The reversal of 1980561989191 is 1919891650891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1980561989191 - 2³ = 1980561989183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980561989171) 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, 954946885 + ... + 954948958.

It is an arithmetic number, because the mean of its divisors is an integer number (266430470238).

Almost surely, 2^{1980561989191} is an apocalyptic number.

1980561989191 is a deficient number, since it is larger than the sum of its proper divisors (150881772713).

1980561989191 is a wasteful number, since it uses less digits than its factorization.

1980561989191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909895921.

The product of its (nonzero) digits is 12597120, while the sum is 67.

The spelling of 1980561989191 in words is "one trillion, nine hundred eighty billion, five hundred sixty-one million, nine hundred eighty-nine thousand, one hundred ninety-one".