866800082636556 has 48 divisors (see below), whose sum is σ = 2087779730211840. Its totient is φ = 279612503040960.

The previous prime is 866800082636507. The next prime is 866800082636557. The reversal of 866800082636556 is 655636280008668.

It is a super-2 number, since 2×866800082636556² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866800082636557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320742795 + ... + 323433981.

It is an arithmetic number, because the mean of its divisors is an integer number (43495411046080).

Almost surely, 2^{866800082636556} is an apocalyptic number.

It is an amenable number.

866800082636556 is an abundant number, since it is smaller than the sum of its proper divisors (1220979647575284).

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

866800082636556 is a wasteful number, since it uses less digits than its factorization.

866800082636556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557054 (or 3557052 counting only the distinct ones).

The product of its (nonzero) digits is 597196800, while the sum is 69.

The spelling of 866800082636556 in words is "eight hundred sixty-six trillion, eight hundred billion, eighty-two million, six hundred thirty-six thousand, five hundred fifty-six".