12505170661 has 4 divisors (see below), whose sum is σ = 12505444000. Its totient is φ = 12504897324.

The previous prime is 12505170659. The next prime is 12505170673. The reversal of 12505170661 is 16607150521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12505170661 - 2¹ = 12505170659 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 (12505170961) 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 3 ways as a sum of consecutive naturals, for example, 49521 + ... + 165718.

It is an arithmetic number, because the mean of its divisors is an integer number (3126361000).

Almost surely, 2^12505170661 is an apocalyptic number.

It is an amenable number.

12505170661 is a deficient number, since it is larger than the sum of its proper divisors (273339).

12505170661 is an equidigital number, since it uses as much as digits as its factorization.

12505170661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273338.

The product of its (nonzero) digits is 12600, while the sum is 34.

The spelling of 12505170661 in words is "twelve billion, five hundred five million, one hundred seventy thousand, six hundred sixty-one".