12464615661 has 4 divisors (see below), whose sum is σ = 16619487552. Its totient is φ = 8309743772.

The previous prime is 12464615659. The next prime is 12464615663. The reversal of 12464615661 is 16651646421.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (12464615659) and next prime (12464615663).

It is a cyclic number.

It is not a de Polignac number, because 12464615661 - 2¹ = 12464615659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12464615663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2077435941 + ... + 2077435946.

It is an arithmetic number, because the mean of its divisors is an integer number (4154871888).

Almost surely, 2^12464615661 is an apocalyptic number.

It is an amenable number.

12464615661 is a deficient number, since it is larger than the sum of its proper divisors (4154871891).

12464615661 is an equidigital number, since it uses as much as digits as its factorization.

12464615661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154871890.

The product of its digits is 207360, while the sum is 42.

The spelling of 12464615661 in words is "twelve billion, four hundred sixty-four million, six hundred fifteen thousand, six hundred sixty-one".