6979991235669 has 24 divisors (see below), whose sum is σ = 10181523975480. Its totient is φ = 4607547276672.

The previous prime is 6979991235647. The next prime is 6979991235673. The reversal of 6979991235669 is 9665321999796.

6979991235669 is a `hidden beast` number, since 6 + 97 + 99 + 91 + 2 + 356 + 6 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 822173800644 + 6157817435025 = 906738^2 + 2481495^2 .

It is not a de Polignac number, because 6979991235669 - 2¹³ = 6979991227477 is a prime.

It is a super-2 number, since 2×6979991235669² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6979991235629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 918214 + ... + 3847479.

It is an arithmetic number, because the mean of its divisors is an integer number (424230165645).

Almost surely, 2^{6979991235669} is an apocalyptic number.

It is an amenable number.

6979991235669 is a deficient number, since it is larger than the sum of its proper divisors (3201532739811).

6979991235669 is a wasteful number, since it uses less digits than its factorization.

6979991235669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4767301 (or 4767298 counting only the distinct ones).

The product of its digits is 2678462640, while the sum is 81.

The spelling of 6979991235669 in words is "six trillion, nine hundred seventy-nine billion, nine hundred ninety-one million, two hundred thirty-five thousand, six hundred sixty-nine".