11691123689 has 12 divisors (see below), whose sum is σ = 13703701968. Its totient is φ = 9944461800.

The previous prime is 11691123683. The next prime is 11691123727. The reversal of 11691123689 is 98632119611.

It is not a de Polignac number, because 11691123689 - 2¹⁶ = 11691058153 is a prime.

It is a super-2 number, since 2×11691123689² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11691123683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 904247 + ... + 917084.

It is an arithmetic number, because the mean of its divisors is an integer number (1141975164).

Almost surely, 2^11691123689 is an apocalyptic number.

It is an amenable number.

11691123689 is a deficient number, since it is larger than the sum of its proper divisors (2012578279).

11691123689 is a wasteful number, since it uses less digits than its factorization.

11691123689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821476 (or 1821469 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The spelling of 11691123689 in words is "eleven billion, six hundred ninety-one million, one hundred twenty-three thousand, six hundred eighty-nine".