1991170711040 has 240 divisors, whose sum is σ = 5575808844144. Its totient is φ = 679956480000.

The previous prime is 1991170711037. The next prime is 1991170711081. The reversal of 1991170711040 is 401170711991.

It is a congruent number.

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, 31453820 + ... + 31517060.

Almost surely, 2^{1991170711040} is an apocalyptic number.

1991170711040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1991170711040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2787904422072).

1991170711040 is an abundant number, since it is smaller than the sum of its proper divisors (3584638133104).

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

1991170711040 is an equidigital number, since it uses as much as digits as its factorization.

1991170711040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63529 (or 63506 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 41.

The spelling of 1991170711040 in words is "one trillion, nine hundred ninety-one billion, one hundred seventy million, seven hundred eleven thousand, forty".