12123561545 has 8 divisors (see below), whose sum is σ = 14549063496. Its totient is φ = 9698322816.

The previous prime is 12123561511. The next prime is 12123561547. The reversal of 12123561545 is 54516532121.

It can be written as a sum of positive squares in 4 ways, for example, as 144696841 + 11978864704 = 12029^2 + 109448^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12123561545 - 2⁶ = 12123561481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12123561547) 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, 56039 + ... + 165491.

It is an arithmetic number, because the mean of its divisors is an integer number (1818632937).

Almost surely, 2^12123561545 is an apocalyptic number.

It is an amenable number.

12123561545 is a deficient number, since it is larger than the sum of its proper divisors (2425501951).

12123561545 is a wasteful number, since it uses less digits than its factorization.

12123561545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131611.

The product of its digits is 36000, while the sum is 35.

The spelling of 12123561545 in words is "twelve billion, one hundred twenty-three million, five hundred sixty-one thousand, five hundred forty-five".