111655560556661 has 12 divisors (see below), whose sum is σ = 124808989116000. Its totient is φ = 99784630383240.

The previous prime is 111655560556609. The next prime is 111655560556663. The reversal of 111655560556661 is 166655065556111.

It is a de Polignac number, because none of the positive numbers 2^k-111655560556661 is a prime.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111655560556661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111655560556663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7820104961 + ... + 7820119238.

It is an arithmetic number, because the mean of its divisors is an integer number (10400749093000).

Almost surely, 2^{111655560556661} is an apocalyptic number.

111655560556661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111655560556661 is a deficient number, since it is larger than the sum of its proper divisors (13153428559339).

111655560556661 is a wasteful number, since it uses less digits than its factorization.

111655560556661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15640224280 (or 15640224269 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 59.

The spelling of 111655560556661 in words is "one hundred eleven trillion, six hundred fifty-five billion, five hundred sixty million, five hundred fifty-six thousand, six hundred sixty-one".