111712172020550 has 24 divisors (see below), whose sum is σ = 212616840891576. Its totient is φ = 43645685811840.

The previous prime is 111712172020549. The next prime is 111712172020693. The reversal of 111712172020550 is 55020271217111.

It is a self number, because there is not a number n which added to its sum of digits gives 111712172020550.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 25979572739 + ... + 25979577038.

It is an arithmetic number, because the mean of its divisors is an integer number (8859035037149).

Almost surely, 2^{111712172020550} is an apocalyptic number.

111712172020550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111712172020550 is a deficient number, since it is larger than the sum of its proper divisors (100904668871026).

111712172020550 is a wasteful number, since it uses less digits than its factorization.

111712172020550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51959149832 (or 51959149827 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 35.

The spelling of 111712172020550 in words is "one hundred eleven trillion, seven hundred twelve billion, one hundred seventy-two million, twenty thousand, five hundred fifty".