1991603774696 has 16 divisors (see below), whose sum is σ = 3734276727300. Its totient is φ = 995796647424.

The previous prime is 1991603774687. The next prime is 1991603774711. The reversal of 1991603774696 is 6964773061991.

It can be written as a sum of positive squares in 2 ways, for example, as 1984745616100 + 6858158596 = 1408810^2 + 82814^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1305560 + ... + 2384888.

Almost surely, 2^{1991603774696} is an apocalyptic number.

It is an amenable number.

1991603774696 is a deficient number, since it is larger than the sum of its proper divisors (1742672952604).

1991603774696 is a wasteful number, since it uses less digits than its factorization.

1991603774696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309988 (or 1309984 counting only the distinct ones).

The product of its (nonzero) digits is 92588832, while the sum is 68.

The spelling of 1991603774696 in words is "one trillion, nine hundred ninety-one billion, six hundred three million, seven hundred seventy-four thousand, six hundred ninety-six".