866786278583481 has 8 divisors (see below), whose sum is σ = 1155971123890080. Its totient is φ = 577729476166272.

The previous prime is 866786278583441. The next prime is 866786278583527. The reversal of 866786278583481 is 184385872687668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 866786278583481 - 2²² = 866786274389177 is a prime.

It is a super-2 number, since 2×866786278583481² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866786278583441) 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, 32010706551 + ... + 32010733628.

It is an arithmetic number, because the mean of its divisors is an integer number (144496390486260).

Almost surely, 2^{866786278583481} is an apocalyptic number.

It is an amenable number.

866786278583481 is a deficient number, since it is larger than the sum of its proper divisors (289184845306599).

866786278583481 is a wasteful number, since it uses less digits than its factorization.

866786278583481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64021444695.

The product of its digits is 41617981440, while the sum is 87.

The spelling of 866786278583481 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, five hundred eighty-three thousand, four hundred eighty-one".