866788366132564 has 12 divisors (see below), whose sum is σ = 1516899387421600. Its totient is φ = 433388541154968.

The previous prime is 866788366132543. The next prime is 866788366132571. The reversal of 866788366132564 is 465231663887668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1410132144 + ... + 1410746695.

Almost surely, 2^{866788366132564} is an apocalyptic number.

It is an amenable number.

866788366132564 is a deficient number, since it is larger than the sum of its proper divisors (650111021289036).

866788366132564 is a wasteful number, since it uses less digits than its factorization.

866788366132564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820955662 (or 2820955660 counting only the distinct ones).

The product of its digits is 10032906240, while the sum is 79.

The spelling of 866788366132564 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, three hundred sixty-six million, one hundred thirty-two thousand, five hundred sixty-four".