12737229561 has 32 divisors (see below), whose sum is σ = 21574502400. Its totient is φ = 7275439440.

The previous prime is 12737229559. The next prime is 12737229599. The reversal of 12737229561 is 16592273721.

It is a happy number.

12737229561 is a `hidden beast` number, since 12 + 7 + 3 + 72 + 2 + 9 + 561 = 666.

It is not a de Polignac number, because 12737229561 - 2¹ = 12737229559 is a prime.

It is a super-2 number, since 2×12737229561² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12737229511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 499950 + ... + 524808.

It is an arithmetic number, because the mean of its divisors is an integer number (674203200).

Almost surely, 2^12737229561 is an apocalyptic number.

It is an amenable number.

12737229561 is a deficient number, since it is larger than the sum of its proper divisors (8837272839).

12737229561 is a wasteful number, since it uses less digits than its factorization.

12737229561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27586 (or 27580 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The spelling of 12737229561 in words is "twelve billion, seven hundred thirty-seven million, two hundred twenty-nine thousand, five hundred sixty-one".