1571166286866 has 256 divisors, whose sum is σ = 3929589158400. Its totient is φ = 465128801280.

The previous prime is 1571166286853. The next prime is 1571166286871. The reversal of 1571166286866 is 6686826611751.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1055181450 + ... + 1055182938.

It is an arithmetic number, because the mean of its divisors is an integer number (15349957650).

Almost surely, 2^{1571166286866} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1571166286866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1964794579200).

1571166286866 is an abundant number, since it is smaller than the sum of its proper divisors (2358422871534).

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

1571166286866 is a wasteful number, since it uses less digits than its factorization.

1571166286866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863 (or 1835 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 1571166286866 in words is "one trillion, five hundred seventy-one billion, one hundred sixty-six million, two hundred eighty-six thousand, eight hundred sixty-six".