12661531403 has 8 divisors (see below), whose sum is σ = 12694544640. Its totient is φ = 12628548520.

The previous prime is 12661531373. The next prime is 12661531411. The reversal of 12661531403 is 30413516621.

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 12661531403 - 2¹⁶ = 12661465867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12661531403.

It is not an unprimeable number, because it can be changed into a prime (12661531423) 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, 994826 + ... + 1007472.

It is an arithmetic number, because the mean of its divisors is an integer number (1586818080).

Almost surely, 2^12661531403 is an apocalyptic number.

12661531403 is a deficient number, since it is larger than the sum of its proper divisors (33013237).

12661531403 is a wasteful number, since it uses less digits than its factorization.

12661531403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15177.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 12661531403 in words is "twelve billion, six hundred sixty-one million, five hundred thirty-one thousand, four hundred three".