4279661567991 has 24 divisors (see below), whose sum is σ = 6239642370000. Its totient is φ = 2826481537152.

The previous prime is 4279661567981. The next prime is 4279661568043. The reversal of 4279661567991 is 1997651669724.

It is a happy number.

4279661567991 is a `hidden beast` number, since 427 + 9 + 6 + 61 + 56 + 7 + 9 + 91 = 666.

It is not a de Polignac number, because 4279661567991 - 2¹¹ = 4279661565943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4279661567981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3702046 + ... + 4718523.

It is an arithmetic number, because the mean of its divisors is an integer number (259985098750).

Almost surely, 2^{4279661567991} is an apocalyptic number.

4279661567991 is a deficient number, since it is larger than the sum of its proper divisors (1959980802009).

4279661567991 is a wasteful number, since it uses less digits than its factorization.

4279661567991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8421103 (or 8421100 counting only the distinct ones).

The product of its digits is 308629440, while the sum is 72.

The spelling of 4279661567991 in words is "four trillion, two hundred seventy-nine billion, six hundred sixty-one million, five hundred sixty-seven thousand, nine hundred ninety-one".