1991965642912 has 48 divisors (see below), whose sum is σ = 4482046783872. Its totient is φ = 853675925760.

The previous prime is 1991965642903. The next prime is 1991965642939. The reversal of 1991965642912 is 2192465691991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9748837 + ... + 9951067.

It is an arithmetic number, because the mean of its divisors is an integer number (93375974664).

Almost surely, 2^{1991965642912} is an apocalyptic number.

It is an amenable number.

1991965642912 is an abundant number, since it is smaller than the sum of its proper divisors (2490081140960).

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

1991965642912 is a wasteful number, since it uses less digits than its factorization.

1991965642912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246221 (or 246213 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 64.

The spelling of 1991965642912 in words is "one trillion, nine hundred ninety-one billion, nine hundred sixty-five million, six hundred forty-two thousand, nine hundred twelve".