12561498123 has 16 divisors (see below), whose sum is σ = 17165584800. Its totient is φ = 8166072320.

The previous prime is 12561498121. The next prime is 12561498163. The reversal of 12561498123 is 32189416521.

It is a cyclic number.

It is not a de Polignac number, because 12561498123 - 2¹ = 12561498121 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12561498121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237883 + ... + 285851.

It is an arithmetic number, because the mean of its divisors is an integer number (1072849050).

Almost surely, 2^12561498123 is an apocalyptic number.

12561498123 is a deficient number, since it is larger than the sum of its proper divisors (4604086677).

12561498123 is a wasteful number, since it uses less digits than its factorization.

12561498123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50142.

The product of its digits is 103680, while the sum is 42.

The spelling of 12561498123 in words is "twelve billion, five hundred sixty-one million, four hundred ninety-eight thousand, one hundred twenty-three".