866543011827636 has 96 divisors (see below), whose sum is σ = 2393551572926976. Its totient is φ = 240539350896000.

The previous prime is 866543011827541. The next prime is 866543011827677. The reversal of 866543011827636 is 636728110345668.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1927173850 + ... + 1927623441.

It is an arithmetic number, because the mean of its divisors is an integer number (24932828884656).

Almost surely, 2^{866543011827636} is an apocalyptic number.

It is an amenable number.

866543011827636 is an abundant number, since it is smaller than the sum of its proper divisors (1527008561099340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866543011827636 is a wasteful number, since it uses less digits than its factorization.

866543011827636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3854797453 (or 3854797451 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 66.

The spelling of 866543011827636 in words is "eight hundred sixty-six trillion, five hundred forty-three billion, eleven million, eight hundred twenty-seven thousand, six hundred thirty-six".