10691111808 has 512 divisors, whose sum is σ = 35697715200. Its totient is φ = 3128647680.

The previous prime is 10691111803. The next prime is 10691111813. The reversal of 10691111808 is 80811119601.

It is an interprime number because it is at equal distance from previous prime (10691111803) and next prime (10691111813).

It is a super-4 number, since 4×10691111808⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10691111803) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 128808535 + ... + 128808617.

It is an arithmetic number, because the mean of its divisors is an integer number (69722100).

Almost surely, 2^10691111808 is an apocalyptic number.

10691111808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10691111808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17848857600).

10691111808 is an abundant number, since it is smaller than the sum of its proper divisors (25006603392).

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

10691111808 is a wasteful number, since it uses less digits than its factorization.

10691111808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 36.

The spelling of 10691111808 in words is "ten billion, six hundred ninety-one million, one hundred eleven thousand, eight hundred eight".