9972891186591 has 16 divisors (see below), whose sum is σ = 13318747885184. Its totient is φ = 6637815674784.

The previous prime is 9972891186563. The next prime is 9972891186593. The reversal of 9972891186591 is 1956811982799.

It is not a de Polignac number, because 9972891186591 - 2³⁴ = 9955711317407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9972891186593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30463920 + ... + 30789546.

It is an arithmetic number, because the mean of its divisors is an integer number (832421742824).

Almost surely, 2^{9972891186591} is an apocalyptic number.

9972891186591 is a deficient number, since it is larger than the sum of its proper divisors (3345856698593).

9972891186591 is a wasteful number, since it uses less digits than its factorization.

9972891186591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342150.

The product of its digits is 176359680, while the sum is 75.

The spelling of 9972891186591 in words is "nine trillion, nine hundred seventy-two billion, eight hundred ninety-one million, one hundred eighty-six thousand, five hundred ninety-one".