1123823267561 has 8 divisors (see below), whose sum is σ = 1217603322144. Its totient is φ = 1033117968960.

The previous prime is 1123823267537. The next prime is 1123823267573. The reversal of 1123823267561 is 1657623283211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123823267561 is a prime.

It is a super-2 number, since 2×1123823267561² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123823260561) 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 7 ways as a sum of consecutive naturals, for example, 768688235 + ... + 768689696.

It is an arithmetic number, because the mean of its divisors is an integer number (152200415268).

Almost surely, 2^{1123823267561} is an apocalyptic number.

It is an amenable number.

1123823267561 is a deficient number, since it is larger than the sum of its proper divisors (93780054583).

1123823267561 is a wasteful number, since it uses less digits than its factorization.

1123823267561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537377991.

The product of its digits is 725760, while the sum is 47.

The spelling of 1123823267561 in words is "one trillion, one hundred twenty-three billion, eight hundred twenty-three million, two hundred sixty-seven thousand, five hundred sixty-one".