11866123840 has 56 divisors (see below), whose sum is σ = 28857439872. Its totient is φ = 4645455360.

The previous prime is 11866123831. The next prime is 11866123847. The reversal of 11866123840 is 4832166811.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 11866123793 and 11866123802.

It is not an unprimeable number, because it can be changed into a prime (11866123847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379446 + ... + 409525.

Almost surely, 2^11866123840 is an apocalyptic number.

11866123840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11866123840 is an abundant number, since it is smaller than the sum of its proper divisors (16991316032).

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

11866123840 is an equidigital number, since it uses as much as digits as its factorization.

11866123840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789035 (or 789025 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 11866123840 in words is "eleven billion, eight hundred sixty-six million, one hundred twenty-three thousand, eight hundred forty".