111044878561 has 4 divisors (see below), whose sum is σ = 111048793492. Its totient is φ = 111040963632.

The previous prime is 111044878559. The next prime is 111044878573. The reversal of 111044878561 is 165878440111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165878440111 = 47 ⋅3529328513.

It can be written as a sum of positive squares in 2 ways, for example, as 6638990400 + 104405888161 = 81480^2 + 323119^2 .

It is a cyclic number.

It is not a de Polignac number, because 111044878561 - 2¹ = 111044878559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111044878541) 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, 1914606 + ... + 1971751.

It is an arithmetic number, because the mean of its divisors is an integer number (27762198373).

Almost surely, 2^111044878561 is an apocalyptic number.

It is an amenable number.

111044878561 is a deficient number, since it is larger than the sum of its proper divisors (3914931).

111044878561 is an equidigital number, since it uses as much as digits as its factorization.

111044878561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3914930.

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 111044878561 in words is "one hundred eleven billion, forty-four million, eight hundred seventy-eight thousand, five hundred sixty-one".