12545247661 has 8 divisors (see below), whose sum is σ = 12814401024. Its totient is φ = 12276187440.

The previous prime is 12545247647. The next prime is 12545247677. The reversal of 12545247661 is 16674254521.

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 12545247661 - 2⁹ = 12545247149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12545247641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295131 + ... + 334951.

It is an arithmetic number, because the mean of its divisors is an integer number (1601800128).

Almost surely, 2^12545247661 is an apocalyptic number.

It is an amenable number.

12545247661 is a deficient number, since it is larger than the sum of its proper divisors (269153363).

12545247661 is an equidigital number, since it uses as much as digits as its factorization.

12545247661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46571.

The product of its digits is 403200, while the sum is 43.

The spelling of 12545247661 in words is "twelve billion, five hundred forty-five million, two hundred forty-seven thousand, six hundred sixty-one".