991393160144 has 40 divisors (see below), whose sum is σ = 2028380264640. Its totient is φ = 468106898688.

The previous prime is 991393160123. The next prime is 991393160203. The reversal of 991393160144 is 441061393199.

It is a junction number, because it is equal to n+sod(n) for n = 991393160092 and 991393160101.

It is a congruent number.

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, 5114372 + ... + 5304675.

It is an arithmetic number, because the mean of its divisors is an integer number (50709506616).

Almost surely, 2^991393160144 is an apocalyptic number.

It is an amenable number.

991393160144 is an abundant number, since it is smaller than the sum of its proper divisors (1036987104496).

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

991393160144 is a wasteful number, since it uses less digits than its factorization.

991393160144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10419387 (or 10419381 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 991393160144 in words is "nine hundred ninety-one billion, three hundred ninety-three million, one hundred sixty thousand, one hundred forty-four".