9999997965181 has 4 divisors (see below), whose sum is σ = 11428569103072. Its totient is φ = 8571426827292.

The previous prime is 9999997965103. The next prime is 9999997965193. The reversal of 9999997965181 is 1815697999999.

9999997965181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9999997965181 - 2⁷ = 9999997965053 is a prime.

It is a super-2 number, since 2×9999997965181² (a number of 27 digits) contains 22 as substring.

It is a pancake number, because a pancake can be divided into 9999997965181 parts by 4472135 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999997965481) 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, 714285568935 + ... + 714285568948.

It is an arithmetic number, because the mean of its divisors is an integer number (2857142275768).

Almost surely, 2^{9999997965181} is an apocalyptic number.

It is an amenable number.

9999997965181 is a deficient number, since it is larger than the sum of its proper divisors (1428571137891).

9999997965181 is a wasteful number, since it uses less digits than its factorization.

9999997965181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428571137890.

The product of its digits is 8035387920, while the sum is 91.

The spelling of 9999997965181 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred sixty-five thousand, one hundred eighty-one".