111661250581617 has 32 divisors (see below), whose sum is σ = 170874434957184. Its totient is φ = 64238509324800.

The previous prime is 111661250581589. The next prime is 111661250581619. The reversal of 111661250581617 is 716185052166111.

It is not a de Polignac number, because 111661250581617 - 2¹⁴ = 111661250565233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111661250581617.

It is not an unprimeable number, because it can be changed into a prime (111661250581619) 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, 1115201838 + ... + 1115301959.

It is an arithmetic number, because the mean of its divisors is an integer number (5339826092412).

Almost surely, 2^{111661250581617} is an apocalyptic number.

It is an amenable number.

111661250581617 is a deficient number, since it is larger than the sum of its proper divisors (59213184375567).

111661250581617 is a wasteful number, since it uses less digits than its factorization.

111661250581617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230503889.

The product of its (nonzero) digits is 604800, while the sum is 51.

The spelling of 111661250581617 in words is "one hundred eleven trillion, six hundred sixty-one billion, two hundred fifty million, five hundred eighty-one thousand, six hundred seventeen".