9967993965631 has 8 divisors (see below), whose sum is σ = 11299750244720. Its totient is φ = 8716950188352.

The previous prime is 9967993965623. The next prime is 9967993965653. The reversal of 9967993965631 is 1365693997699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9967993965631 - 2³ = 9967993965623 is a prime.

It is a super-2 number, since 2×9967993965631² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9967993965031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20178125190 + ... + 20178125683.

It is an arithmetic number, because the mean of its divisors is an integer number (1412468780590).

Almost surely, 2^{9967993965631} is an apocalyptic number.

9967993965631 is a deficient number, since it is larger than the sum of its proper divisors (1331756279089).

9967993965631 is a wasteful number, since it uses less digits than its factorization.

9967993965631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40356250905.

The product of its digits is 4017693960, while the sum is 82.

The spelling of 9967993965631 in words is "nine trillion, nine hundred sixty-seven billion, nine hundred ninety-three million, nine hundred sixty-five thousand, six hundred thirty-one".