866186666447782 has 48 divisors (see below), whose sum is σ = 1340584864128000. Its totient is φ = 419727267305280.

The previous prime is 866186666447749. The next prime is 866186666447783. The reversal of 866186666447782 is 287744666681668.

It is a super-2 number, since 2×866186666447782² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866186666447782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866186666447783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1095068643 + ... + 1095859345.

It is an arithmetic number, because the mean of its divisors is an integer number (27928851336000).

Almost surely, 2^{866186666447782} is an apocalyptic number.

866186666447782 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

866186666447782 is a deficient number, since it is larger than the sum of its proper divisors (474398197680218).

866186666447782 is a wasteful number, since it uses less digits than its factorization.

866186666447782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792949 (or 792908 counting only the distinct ones).

The product of its digits is 37456183296, while the sum is 85.

The spelling of 866186666447782 in words is "eight hundred sixty-six trillion, one hundred eighty-six billion, six hundred sixty-six million, four hundred forty-seven thousand, seven hundred eighty-two".