866571669090 has 24 divisors (see below), whose sum is σ = 2253086339868. Its totient is φ = 231085778400.

The previous prime is 866571669049. The next prime is 866571669121. The reversal of 866571669090 is 90966175668.

It can be written as a sum of positive squares in 2 ways, for example, as 832888041129 + 33683627961 = 912627^2 + 183531^2 .

It is a super-2 number, since 2×866571669090² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4814286961 + ... + 4814287140.

Almost surely, 2^866571669090 is an apocalyptic number.

866571669090 is an abundant number, since it is smaller than the sum of its proper divisors (1386514670778).

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

866571669090 is a wasteful number, since it uses less digits than its factorization.

866571669090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9628574114 (or 9628574111 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 866571669090 in words is "eight hundred sixty-six billion, five hundred seventy-one million, six hundred sixty-nine thousand, ninety".