12661455123 has 6 divisors (see below), whose sum is σ = 18288768524. Its totient is φ = 8440970076.

The previous prime is 12661455091. The next prime is 12661455229. The reversal of 12661455123 is 32155416621.

12661455123 is a `hidden beast` number, since 1 + 26 + 61 + 4 + 551 + 23 = 666.

It is not a de Polignac number, because 12661455123 - 2⁵ = 12661455091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661451123) 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 5 ways as a sum of consecutive naturals, for example, 703414165 + ... + 703414182.

Almost surely, 2^12661455123 is an apocalyptic number.

12661455123 is a deficient number, since it is larger than the sum of its proper divisors (5627313401).

12661455123 is a wasteful number, since it uses less digits than its factorization.

12661455123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406828353 (or 1406828350 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 12661455123 in words is "twelve billion, six hundred sixty-one million, four hundred fifty-five thousand, one hundred twenty-three".