7898666841 has 12 divisors (see below), whose sum is σ = 12286815268. Its totient is φ = 4860717984.

The previous prime is 7898666819. The next prime is 7898666843. The reversal of 7898666841 is 1486668987.

It can be written as a sum of positive squares in 2 ways, for example, as 5026242816 + 2872424025 = 70896^2 + 53595^2 .

It is not a de Polignac number, because 7898666841 - 2⁶ = 7898666777 is a prime.

It is a super-2 number, since 2×7898666841² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7898666843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33754870 + ... + 33755103.

Almost surely, 2^7898666841 is an apocalyptic number.

It is an amenable number.

7898666841 is a deficient number, since it is larger than the sum of its proper divisors (4388148427).

7898666841 is a wasteful number, since it uses less digits than its factorization.

7898666841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67509992 (or 67509989 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The square root of 7898666841 is about 88874.4442514270. Note that the first 3 decimals coincide. The cubic root of 7898666841 is about 1991.5196628470.

The spelling of 7898666841 in words is "seven billion, eight hundred ninety-eight million, six hundred sixty-six thousand, eight hundred forty-one".