866513800777636 has 24 divisors (see below), whose sum is σ = 1694601268930080. Its totient is φ = 384263326286400.

The previous prime is 866513800777627. The next prime is 866513800777643. The reversal of 866513800777636 is 636777008315668.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240164577126 + ... + 240164580733.

It is an arithmetic number, because the mean of its divisors is an integer number (70608386205420).

Almost surely, 2^{866513800777636} is an apocalyptic number.

It is an amenable number.

866513800777636 is a deficient number, since it is larger than the sum of its proper divisors (828087468152444).

866513800777636 is a wasteful number, since it uses less digits than its factorization.

866513800777636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480329157915 (or 480329157913 counting only the distinct ones).

The product of its (nonzero) digits is 1280240640, while the sum is 73.

The spelling of 866513800777636 in words is "eight hundred sixty-six trillion, five hundred thirteen billion, eight hundred million, seven hundred seventy-seven thousand, six hundred thirty-six".