866757677885317 has 4 divisors (see below), whose sum is σ = 866898088984620. Its totient is φ = 866617266786016.

The previous prime is 866757677885311. The next prime is 866757677885327. The reversal of 866757677885317 is 713588776757668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180125146787041 + 686632531098276 = 13421071^2 + 26203674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866757677885317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866757677885311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70205540392 + ... + 70205552737.

It is an arithmetic number, because the mean of its divisors is an integer number (216724522246155).

Almost surely, 2^{866757677885317} is an apocalyptic number.

It is an amenable number.

866757677885317 is a deficient number, since it is larger than the sum of its proper divisors (140411099303).

866757677885317 is a wasteful number, since it uses less digits than its factorization.

866757677885317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140411099302.

The product of its digits is 139403980800, while the sum is 91.

The spelling of 866757677885317 in words is "eight hundred sixty-six trillion, seven hundred fifty-seven billion, six hundred seventy-seven million, eight hundred eighty-five thousand, three hundred seventeen".