111661788810 has 64 divisors (see below), whose sum is σ = 314839405440. Its totient is φ = 24987252480.

The previous prime is 111661788793. The next prime is 111661788817. The reversal of 111661788810 is 18887166111.

It is a super-2 number, since 2×111661788810² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111661788810.

It is not an unprimeable number, because it can be changed into a prime (111661788817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13009905 + ... + 13018484.

It is an arithmetic number, because the mean of its divisors is an integer number (4919365710).

Almost surely, 2^111661788810 is an apocalyptic number.

111661788810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111661788810 is an abundant number, since it is smaller than the sum of its proper divisors (203177616630).

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

111661788810 is a wasteful number, since it uses less digits than its factorization.

111661788810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26028423.

The product of its (nonzero) digits is 129024, while the sum is 48.

The spelling of 111661788810 in words is "one hundred eleven billion, six hundred sixty-one million, seven hundred eighty-eight thousand, eight hundred ten".