6679841842521 has 45 divisors (see below), whose sum is σ = 10033416998319. Its totient is φ = 4428866030400.

The previous prime is 6679841842477. The next prime is 6679841842573. The reversal of 6679841842521 is 1252481489766.

It is a happy number.

The square root of 6679841842521 is 2584539.

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

6679841842521 is a `hidden beast` number, since 6 + 6 + 7 + 98 + 4 + 18 + 4 + 2 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1134947184921 + 5544894657600 = 1065339^2 + 2354760^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6679841842521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6679841842321) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 4908038881 + ... + 4908040241.

Almost surely, 2^{6679841842521} is an apocalyptic number.

6679841842521 is the 2584539-th square number.

6679841842521 is the 1292270-th centered octagonal number.

It is an amenable number.

6679841842521 is a deficient number, since it is larger than the sum of its proper divisors (3353575155798).

6679841842521 is an frugal number, since it uses more digits than its factorization.

6679841842521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156 (or 1575 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 6679841842521 in words is "six trillion, six hundred seventy-nine billion, eight hundred forty-one million, eight hundred forty-two thousand, five hundred twenty-one".