111560949561 has 4 divisors (see below), whose sum is σ = 148747932752. Its totient is φ = 74373966372.

The previous prime is 111560949553. The next prime is 111560949569. The reversal of 111560949561 is 165949065111.

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 an emirpimes, since its reverse is a distinct semiprime: 165949065111 = 3 ⋅55316355037.

It is an interprime number because it is at equal distance from previous prime (111560949553) and next prime (111560949569).

It is not a de Polignac number, because 111560949561 - 2³ = 111560949553 is a prime.

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 111560949561.

It is not an unprimeable number, because it can be changed into a prime (111560949569) 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, 18593491591 + ... + 18593491596.

It is an arithmetic number, because the mean of its divisors is an integer number (37186983188).

Almost surely, 2^111560949561 is an apocalyptic number.

It is an amenable number.

111560949561 is a deficient number, since it is larger than the sum of its proper divisors (37186983191).

111560949561 is an equidigital number, since it uses as much as digits as its factorization.

111560949561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37186983190.

The product of its (nonzero) digits is 291600, while the sum is 48.

The spelling of 111560949561 in words is "one hundred eleven billion, five hundred sixty million, nine hundred forty-nine thousand, five hundred sixty-one".