1101561606511 has 4 divisors (see below), whose sum is σ = 1101672874024. Its totient is φ = 1101450339000.

The previous prime is 1101561606491. The next prime is 1101561606547. The reversal of 1101561606511 is 1156061651011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1101561606511 - 2³³ = 1092971671919 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 (1101561600511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55618905 + ... + 55638706.

It is an arithmetic number, because the mean of its divisors is an integer number (275418218506).

Almost surely, 2^{1101561606511} is an apocalyptic number.

1101561606511 is a deficient number, since it is larger than the sum of its proper divisors (111267513).

1101561606511 is an equidigital number, since it uses as much as digits as its factorization.

1101561606511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111267512.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 1101561606511 in words is "one trillion, one hundred one billion, five hundred sixty-one million, six hundred six thousand, five hundred eleven".