2666555892 has 486 divisors, whose sum is σ = 9590586642. Its totient is φ = 618710400.

The previous prime is 2666555867. The next prime is 2666555911. The reversal of 2666555892 is 2985556662.

It can be written as a sum of positive squares in only one way, i.e., 1846077156 + 820478736 = 42966^2 + 28644^2 .

It is a super-2 number, since 2×2666555892² = 14221040650319831328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 161 ways as a sum of consecutive naturals, for example, 86017917 + ... + 86017947.

Almost surely, 2^2666555892 is an apocalyptic number.

2666555892 is a gapful number since it is divisible by the number (22) 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 2666555892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4795293321).

2666555892 is an abundant number, since it is smaller than the sum of its proper divisors (6924030750).

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

2666555892 is a wasteful number, since it uses less digits than its factorization.

2666555892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 67 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 54.

The square root of 2666555892 is about 51638.7053671953. The cubic root of 2666555892 is about 1386.7033467194.

The spelling of 2666555892 in words is "two billion, six hundred sixty-six million, five hundred fifty-five thousand, eight hundred ninety-two".