9958981167391 has 4 divisors (see below), whose sum is σ = 10002853331352. Its totient is φ = 9915109003432.

The previous prime is 9958981167383. The next prime is 9958981167397. The reversal of 9958981167391 is 1937611898599.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9958981167391 - 2³ = 9958981167383 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 (9958981167397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21936081640 + ... + 21936082093.

It is an arithmetic number, because the mean of its divisors is an integer number (2500713332838).

Almost surely, 2^{9958981167391} is an apocalyptic number.

9958981167391 is a deficient number, since it is larger than the sum of its proper divisors (43872163961).

9958981167391 is a wasteful number, since it uses less digits than its factorization.

9958981167391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43872163960.

The product of its digits is 264539520, while the sum is 76.

The spelling of 9958981167391 in words is "nine trillion, nine hundred fifty-eight billion, nine hundred eighty-one million, one hundred sixty-seven thousand, three hundred ninety-one".