11891697936 has 40 divisors (see below), whose sum is σ = 30724131744. Its totient is φ = 3963394560.

The previous prime is 11891697899. The next prime is 11891697947. The reversal of 11891697936 is 63979619811.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 11891697936.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698971 + ... + 715781.

Almost surely, 2^11891697936 is an apocalyptic number.

11891697936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11891697936 is an abundant number, since it is smaller than the sum of its proper divisors (18832433808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11891697936 is a wasteful number, since it uses less digits than its factorization.

11891697936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31559 (or 31553 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 60.

The spelling of 11891697936 in words is "eleven billion, eight hundred ninety-one million, six hundred ninety-seven thousand, nine hundred thirty-six".