868217690569872 has 20 divisors (see below), whose sum is σ = 2242895700638960. Its totient is φ = 289405896856608.

The previous prime is 868217690569871. The next prime is 868217690569891. The reversal of 868217690569872 is 278965096712868.

It is a super-2 number, since 2×868217690569872² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (868217690569871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9043934276722 + ... + 9043934276817.

It is an arithmetic number, because the mean of its divisors is an integer number (112144785031948).

Almost surely, 2^{868217690569872} is an apocalyptic number.

It is an amenable number.

868217690569872 is an abundant number, since it is smaller than the sum of its proper divisors (1374678010069088).

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

868217690569872 is a wasteful number, since it uses less digits than its factorization.

868217690569872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18087868553550 (or 18087868553544 counting only the distinct ones).

The product of its (nonzero) digits is 8778792960, while the sum is 84.

The spelling of 868217690569872 in words is "eight hundred sixty-eight trillion, two hundred seventeen billion, six hundred ninety million, five hundred sixty-nine thousand, eight hundred seventy-two".