1181994840558 has 48 divisors (see below), whose sum is σ = 2994910528896. Its totient is φ = 329859023760.

The previous prime is 1181994840527. The next prime is 1181994840569. The reversal of 1181994840558 is 8550484991811.

1181994840558 is a `hidden beast` number, since 1 + 18 + 1 + 99 + 484 + 0 + 5 + 58 = 666.

It is a super-3 number, since 3×1181994840558³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 1181994840495 and 1181994840504.

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, 109074948 + ... + 109085783.

It is an arithmetic number, because the mean of its divisors is an integer number (62393969352).

Almost surely, 2^{1181994840558} is an apocalyptic number.

1181994840558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1181994840558 is an abundant number, since it is smaller than the sum of its proper divisors (1812915688338).

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

1181994840558 is a wasteful number, since it uses less digits than its factorization.

1181994840558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218160789 (or 218160786 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 63.

The spelling of 1181994840558 in words is "one trillion, one hundred eighty-one billion, nine hundred ninety-four million, eight hundred forty thousand, five hundred fifty-eight".