1161123456305 has 16 divisors (see below), whose sum is σ = 1453965980544. Its totient is φ = 888488958720.

The previous prime is 1161123456247. The next prime is 1161123456313. The reversal of 1161123456305 is 5036543211611.

It is not a de Polignac number, because 1161123456305 - 2⁸ = 1161123456049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5349302 + ... + 5562128.

It is an arithmetic number, because the mean of its divisors is an integer number (90872873784).

Almost surely, 2^{1161123456305} is an apocalyptic number.

It is an amenable number.

1161123456305 is a deficient number, since it is larger than the sum of its proper divisors (292842524239).

1161123456305 is a wasteful number, since it uses less digits than its factorization.

1161123456305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260296.

The product of its (nonzero) digits is 64800, while the sum is 38.

Adding to 1161123456305 its reverse (5036543211611), we get a palindrome (6197666667916).

The spelling of 1161123456305 in words is "one trillion, one hundred sixty-one billion, one hundred twenty-three million, four hundred fifty-six thousand, three hundred five".