111561655061 has 4 divisors (see below), whose sum is σ = 111562723392. Its totient is φ = 111560586732.

The previous prime is 111561655033. The next prime is 111561655081. The reversal of 111561655061 is 160556165111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 111561655061 - 2¹⁴ = 111561638677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111561655001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358205 + ... + 592818.

It is an arithmetic number, because the mean of its divisors is an integer number (27890680848).

Almost surely, 2^111561655061 is an apocalyptic number.

It is an amenable number.

111561655061 is a deficient number, since it is larger than the sum of its proper divisors (1068331).

111561655061 is an equidigital number, since it uses as much as digits as its factorization.

111561655061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068330.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 111561655061 in words is "one hundred eleven billion, five hundred sixty-one million, six hundred fifty-five thousand, sixty-one".