1011616055561 has 16 divisors (see below), whose sum is σ = 1039103589888. Its totient is φ = 984379723200.

The previous prime is 1011616055537. The next prime is 1011616055563. The reversal of 1011616055561 is 1655506161101.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011616055561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011616055563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41425391 + ... + 41449803.

It is an arithmetic number, because the mean of its divisors is an integer number (64943974368).

Almost surely, 2^{1011616055561} is an apocalyptic number.

It is an amenable number.

1011616055561 is a deficient number, since it is larger than the sum of its proper divisors (27487534327).

1011616055561 is a wasteful number, since it uses less digits than its factorization.

1011616055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29512.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 1011616055561 in words is "one trillion, eleven billion, six hundred sixteen million, fifty-five thousand, five hundred sixty-one".