2666806861824 has 560 divisors, whose sum is σ = 9641037957408. Its totient is φ = 717103300608.

The previous prime is 2666806861801. The next prime is 2666806861843. The reversal of 2666806861824 is 4281686086662.

It is a happy number.

It is a super-2 number, since 2×2666806861824² (a number of 26 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 78945802 + ... + 78979574.

Almost surely, 2^{2666806861824} is an apocalyptic number.

2666806861824 is a gapful number since it is divisible by the number (24) 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 2666806861824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4820518978704).

2666806861824 is an abundant number, since it is smaller than the sum of its proper divisors (6974231095584).

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

2666806861824 is an equidigital number, since it uses as much as digits as its factorization.

2666806861824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33835 (or 33802 counting only the distinct ones).

The product of its (nonzero) digits is 63700992, while the sum is 63.

The spelling of 2666806861824 in words is "two trillion, six hundred sixty-six billion, eight hundred six million, eight hundred sixty-one thousand, eight hundred twenty-four".