866870861481 has 15 divisors (see below), whose sum is σ = 1294967755213. Its totient is φ = 577908321300.

The previous prime is 866870861473. The next prime is 866870861579. The reversal of 866870861481 is 184168078668.

The square root of 866870861481 is 931059.

It is a perfect power (a square), and thus also a powerful number.

866870861481 is a `hidden beast` number, since 8 + 6 + 6 + 8 + 7 + 0 + 8 + 614 + 8 + 1 = 666.

It is not a de Polignac number, because 866870861481 - 2³ = 866870861473 is a prime.

It is a super-2 number, since 2×866870861481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866870861431) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 8327806 + ... + 8431256.

Almost surely, 2^866870861481 is an apocalyptic number.

866870861481 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

866870861481 is the 931059-th square number.

866870861481 is the 465530-th centered octagonal number.

It is an amenable number.

866870861481 is a deficient number, since it is larger than the sum of its proper divisors (428096893732).

866870861481 is an frugal number, since it uses more digits than its factorization.

866870861481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206914 (or 103454 counting only the distinct ones).

The product of its (nonzero) digits is 24772608, while the sum is 63.

The spelling of 866870861481 in words is "eight hundred sixty-six billion, eight hundred seventy million, eight hundred sixty-one thousand, four hundred eighty-one".