1123051605561 has 6 divisors (see below), whose sum is σ = 1622185652490. Its totient is φ = 748701070368.

The previous prime is 1123051605463. The next prime is 1123051605569. The reversal of 1123051605561 is 1655061503211.

1123051605561 is a `hidden beast` number, since 1 + 1 + 2 + 30 + 5 + 1 + 60 + 5 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 614334602025 + 508717003536 = 783795^2 + 713244^2 .

It is not a de Polignac number, because 1123051605561 - 2²¹ = 1123049508409 is a prime.

It is a super-2 number, since 2×1123051605561² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123051605569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62391755856 + ... + 62391755873.

It is an arithmetic number, because the mean of its divisors is an integer number (270364275415).

Almost surely, 2^{1123051605561} is an apocalyptic number.

It is an amenable number.

1123051605561 is a deficient number, since it is larger than the sum of its proper divisors (499134046929).

1123051605561 is a wasteful number, since it uses less digits than its factorization.

1123051605561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124783511735 (or 124783511732 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 1123051605561 in words is "one trillion, one hundred twenty-three billion, fifty-one million, six hundred five thousand, five hundred sixty-one".