1991149502280 has 64 divisors (see below), whose sum is σ = 5973547858560. Its totient is φ = 530964369408.

The previous prime is 1991149502239. The next prime is 1991149502327. The reversal of 1991149502280 is 822059411991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10527829 + ... + 10715291.

It is an arithmetic number, because the mean of its divisors is an integer number (93336685290).

Almost surely, 2^{1991149502280} is an apocalyptic number.

1991149502280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1991149502280 is an abundant number, since it is smaller than the sum of its proper divisors (3982398356280).

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

1991149502280 is a wasteful number, since it uses less digits than its factorization.

1991149502280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275990 (or 275986 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 51.

The spelling of 1991149502280 in words is "one trillion, nine hundred ninety-one billion, one hundred forty-nine million, five hundred two thousand, two hundred eighty".