12661520888247 has 16 divisors (see below), whose sum is σ = 21047723035392. Its totient is φ = 6577413448320.

The previous prime is 12661520888167. The next prime is 12661520888257. The reversal of 12661520888247 is 74288802516621.

It is a happy number.

It is not a de Polignac number, because 12661520888247 - 2¹⁸ = 12661520626103 is a prime.

It is a super-2 number, since 2×12661520888247² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661520888257) 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, 27405889138 + ... + 27405889599.

It is an arithmetic number, because the mean of its divisors is an integer number (1315482689712).

Almost surely, 2^{12661520888247} is an apocalyptic number.

12661520888247 is a deficient number, since it is larger than the sum of its proper divisors (8386202147145).

12661520888247 is a wasteful number, since it uses less digits than its factorization.

12661520888247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54811778758.

The product of its (nonzero) digits is 20643840, while the sum is 60.

The spelling of 12661520888247 in words is "twelve trillion, six hundred sixty-one billion, five hundred twenty million, eight hundred eighty-eight thousand, two hundred forty-seven".