17878096681 has 3 divisors (see below), whose sum is σ = 17878230391. Its totient is φ = 17877962972.

The previous prime is 17878096669. The next prime is 17878096693. The reversal of 17878096681 is 18669087871.

The square root of 17878096681 is 133709.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (17878096669) and next prime (17878096693).

It can be written as a sum of positive squares in only one way, i.e., 17620173081 + 257923600 = 132741^2 + 16060^2 .

It is not a de Polignac number, because 17878096681 - 2⁷ = 17878096553 is a prime.

It is a super-2 number, since 2×17878096681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17878096601) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 66855 + ... + 200563.

Almost surely, 2^17878096681 is an apocalyptic number.

17878096681 is the 133709-th square number.

17878096681 is the 66855-th centered octagonal number.

It is an amenable number.

17878096681 is a deficient number, since it is larger than the sum of its proper divisors (133710).

17878096681 is an frugal number, since it uses more digits than its factorization.

17878096681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267418 (or 133709 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 61.

The spelling of 17878096681 in words is "seventeen billion, eight hundred seventy-eight million, ninety-six thousand, six hundred eighty-one".