11815871967 has 24 divisors (see below), whose sum is σ = 17640376416. Its totient is φ = 7615498176.

The previous prime is 11815871953. The next prime is 11815871971. The reversal of 11815871967 is 76917851811.

It is not a de Polignac number, because 11815871967 - 2⁷ = 11815871839 is a prime.

It is a super-2 number, since 2×11815871967² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11815871987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60723 + ... + 165284.

It is an arithmetic number, because the mean of its divisors is an integer number (735015684).

Almost surely, 2^11815871967 is an apocalyptic number.

11815871967 is a deficient number, since it is larger than the sum of its proper divisors (5824504449).

11815871967 is a wasteful number, since it uses less digits than its factorization.

11815871967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226207 (or 226204 counting only the distinct ones).

The product of its digits is 846720, while the sum is 54.

The spelling of 11815871967 in words is "eleven billion, eight hundred fifteen million, eight hundred seventy-one thousand, nine hundred sixty-seven".