9618144926991 has 32 divisors (see below), whose sum is σ = 13390349518848. Its totient is φ = 6129377606880.

The previous prime is 9618144926941. The next prime is 9618144927029. The reversal of 9618144926991 is 1996294418169.

It is not a de Polignac number, because 9618144926991 - 2¹⁵ = 9618144894223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9618144926921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1046925300 + ... + 1046934486.

It is an arithmetic number, because the mean of its divisors is an integer number (418448422464).

Almost surely, 2^{9618144926991} is an apocalyptic number.

9618144926991 is a deficient number, since it is larger than the sum of its proper divisors (3772204591857).

9618144926991 is a wasteful number, since it uses less digits than its factorization.

9618144926991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17291.

The product of its digits is 60466176, while the sum is 69.

The spelling of 9618144926991 in words is "nine trillion, six hundred eighteen billion, one hundred forty-four million, nine hundred twenty-six thousand, nine hundred ninety-one".