1111005002561 has 4 divisors (see below), whose sum is σ = 1121388226992. Its totient is φ = 1100621778132.

The previous prime is 1111005002533. The next prime is 1111005002587. The reversal of 1111005002561 is 1652005001111.

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.

It is a cyclic number.

It is not a de Polignac number, because 1111005002561 - 2²⁶ = 1110937893697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111005004561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5191612055 + ... + 5191612268.

It is an arithmetic number, because the mean of its divisors is an integer number (280347056748).

Almost surely, 2^{1111005002561} is an apocalyptic number.

It is an amenable number.

1111005002561 is a deficient number, since it is larger than the sum of its proper divisors (10383224431).

1111005002561 is a wasteful number, since it uses less digits than its factorization.

1111005002561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10383224430.

The product of its (nonzero) digits is 300, while the sum is 23.

The spelling of 1111005002561 in words is "one trillion, one hundred eleven billion, five million, two thousand, five hundred sixty-one".