1091851591680 has 560 divisors, whose sum is σ = 3937028350464. Its totient is φ = 289467924480.

The previous prime is 1091851591651. The next prime is 1091851591703. The reversal of 1091851591680 is 861951581901.

1091851591680 is a `hidden beast` number, since 109 + 1 + 8 + 515 + 9 + 16 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 633691299 + ... + 633693021.

Almost surely, 2^{1091851591680} is an apocalyptic number.

1091851591680 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 1091851591680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1968514175232).

1091851591680 is an abundant number, since it is smaller than the sum of its proper divisors (2845176758784).

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

1091851591680 is an equidigital number, since it uses as much as digits as its factorization.

1091851591680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957 (or 1924 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 54.

The spelling of 1091851591680 in words is "one trillion, ninety-one billion, eight hundred fifty-one million, five hundred ninety-one thousand, six hundred eighty".