91688888619 has 6 divisors (see below), whose sum is σ = 132439505796. Its totient is φ = 61125925740.

The previous prime is 91688888579. The next prime is 91688888623.

It is a happy number.

91688888619 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 91688888619 - 2¹¹ = 91688886571 is a prime.

It is a super-2 number, since 2×91688888619² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91688888659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5093827137 + ... + 5093827154.

It is an arithmetic number, because the mean of its divisors is an integer number (22073250966).

Almost surely, 2^91688888619 is an apocalyptic number.

91688888619 is a deficient number, since it is larger than the sum of its proper divisors (40750617177).

91688888619 is a wasteful number, since it uses less digits than its factorization.

91688888619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10187654297 (or 10187654294 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 72.

The spelling of 91688888619 in words is "ninety-one billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred nineteen".