866786274780417 has 12 divisors (see below), whose sum is σ = 1252030877754384. Its totient is φ = 577854627923160.

The previous prime is 866786274780313. The next prime is 866786274780509. The reversal of 866786274780417 is 714087472687668.

866786274780417 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 62 + 74 + 78 + 0 + 417 = 666.

It is not a de Polignac number, because 866786274780417 - 2⁸ = 866786274780161 is a prime.

It is a super-2 number, since 2×866786274780417² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866786274780017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238815183 + ... + 242417540.

It is an arithmetic number, because the mean of its divisors is an integer number (104335906479532).

Almost surely, 2^{866786274780417} is an apocalyptic number.

It is an amenable number.

866786274780417 is a deficient number, since it is larger than the sum of its proper divisors (385244602973967).

866786274780417 is a wasteful number, since it uses less digits than its factorization.

866786274780417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481432860 (or 481432857 counting only the distinct ones).

The product of its (nonzero) digits is 8497004544, while the sum is 81.

The spelling of 866786274780417 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-four million, seven hundred eighty thousand, four hundred seventeen".