1091863685880 has 384 divisors, whose sum is σ = 4101023908800. Its totient is φ = 248992972800.

The previous prime is 1091863685867. The next prime is 1091863685929. The reversal of 1091863685880 is 885863681901.

1091863685880 is a `hidden beast` number, since 1 + 0 + 9 + 18 + 6 + 36 + 8 + 588 + 0 = 666.

It is a super-2 number, since 2×1091863685880² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 192599686 + ... + 192605354.

Almost surely, 2^{1091863685880} is an apocalyptic number.

1091863685880 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 1091863685880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2050511954400).

1091863685880 is an abundant number, since it is smaller than the sum of its proper divisors (3009160222920).

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

1091863685880 is a wasteful number, since it uses less digits than its factorization.

1091863685880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8575 (or 8568 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 1091863685880 in words is "one trillion, ninety-one billion, eight hundred sixty-three million, six hundred eighty-five thousand, eight hundred eighty".