111001005561 has 8 divisors (see below), whose sum is σ = 148057561440. Its totient is φ = 73972560032.

The previous prime is 111001005551. The next prime is 111001005587. The reversal of 111001005561 is 165500100111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111001005561 - 2⁵ = 111001005529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111001005551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7018371 + ... + 7034168.

It is an arithmetic number, because the mean of its divisors is an integer number (18507195180).

Almost surely, 2^111001005561 is an apocalyptic number.

It is an amenable number.

111001005561 is a deficient number, since it is larger than the sum of its proper divisors (37056555879).

111001005561 is a wasteful number, since it uses less digits than its factorization.

111001005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14055175.

The product of its (nonzero) digits is 150, while the sum is 21.

Adding to 111001005561 its reverse (165500100111), we get a palindrome (276501105672).

The spelling of 111001005561 in words is "one hundred eleven billion, one million, five thousand, five hundred sixty-one".