1991173965192 has 96 divisors (see below), whose sum is σ = 5772898010880. Its totient is φ = 642314162880.

The previous prime is 1991173965149. The next prime is 1991173965217. The reversal of 1991173965192 is 2915693711991.

1991173965192 is a `hidden beast` number, since 19 + 9 + 1 + 17 + 3 + 96 + 519 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16460163 + ... + 16580690.

It is an arithmetic number, because the mean of its divisors is an integer number (60134354280).

Almost surely, 2^{1991173965192} is an apocalyptic number.

1991173965192 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1991173965192 is an abundant number, since it is smaller than the sum of its proper divisors (3781724045688).

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

1991173965192 is a wasteful number, since it uses less digits than its factorization.

1991173965192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33040905 (or 33040889 counting only the distinct ones).

The product of its digits is 8266860, while the sum is 63.

The spelling of 1991173965192 in words is "one trillion, nine hundred ninety-one billion, one hundred seventy-three million, nine hundred sixty-five thousand, one hundred ninety-two".