866755949557668 has 24 divisors (see below), whose sum is σ = 2110362311967168. Its totient is φ = 276356969424096.

The previous prime is 866755949557661. The next prime is 866755949557801.

866755949557668 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×866755949557668² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866755949557661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1570210053271 + ... + 1570210053822.

It is an arithmetic number, because the mean of its divisors is an integer number (87931762998632).

Almost surely, 2^{866755949557668} is an apocalyptic number.

It is an amenable number.

866755949557668 is an abundant number, since it is smaller than the sum of its proper divisors (1243606362409500).

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

866755949557668 is a wasteful number, since it uses less digits than its factorization.

866755949557668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3140420107123 (or 3140420107121 counting only the distinct ones).

The product of its digits is 823011840000, while the sum is 96.

The spelling of 866755949557668 in words is "eight hundred sixty-six trillion, seven hundred fifty-five billion, nine hundred forty-nine million, five hundred fifty-seven thousand, six hundred sixty-eight".