1166618971728 has 160 divisors (see below), whose sum is σ = 4028425497600. Its totient is φ = 315776548224.

The previous prime is 1166618971699. The next prime is 1166618971787. The reversal of 1166618971728 is 8271798166611.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10094826 + ... + 10209737.

It is an arithmetic number, because the mean of its divisors is an integer number (25177659360).

Almost surely, 2^{1166618971728} is an apocalyptic number.

1166618971728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1166618971728 is an abundant number, since it is smaller than the sum of its proper divisors (2861806525872).

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

1166618971728 is a wasteful number, since it uses less digits than its factorization.

1166618971728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20304606 (or 20304594 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The spelling of 1166618971728 in words is "one trillion, one hundred sixty-six billion, six hundred eighteen million, nine hundred seventy-one thousand, seven hundred twenty-eight".