1166161551500 has 192 divisors, whose sum is σ = 2804532232320. Its totient is φ = 420094080000.

The previous prime is 1166161551493. The next prime is 1166161551517. The reversal of 1166161551500 is 51551616611.

It is a happy number.

It is a super-5 number, since 5×1166161551500⁵ (a number of 62 digits) contains 55555 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 275751386 + ... + 275755614.

It is an arithmetic number, because the mean of its divisors is an integer number (14606938710).

Almost surely, 2^{1166161551500} is an apocalyptic number.

1166161551500 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 1166161551500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1402266116160).

1166161551500 is an abundant number, since it is smaller than the sum of its proper divisors (1638370680820).

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

1166161551500 is a wasteful number, since it uses less digits than its factorization.

1166161551500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717 (or 4705 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 38.

It can be divided in two parts, 116 and 6161551500, that added together give a palindrome (6161551616).

The spelling of 1166161551500 in words is "one trillion, one hundred sixty-six billion, one hundred sixty-one million, five hundred fifty-one thousand, five hundred".