12664644587 has 8 divisors (see below), whose sum is σ = 14719200000. Its totient is φ = 10671419304.

The previous prime is 12664644569. The next prime is 12664644593. The reversal of 12664644587 is 78544646621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12664644587 - 2⁸ = 12664644331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12664647587) 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, 15332087 + ... + 15332912.

It is an arithmetic number, because the mean of its divisors is an integer number (1839900000).

Almost surely, 2^12664644587 is an apocalyptic number.

12664644587 is a deficient number, since it is larger than the sum of its proper divisors (2054555413).

12664644587 is an equidigital number, since it uses as much as digits as its factorization.

12664644587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30665065.

The product of its digits is 7741440, while the sum is 53.

The spelling of 12664644587 in words is "twelve billion, six hundred sixty-four million, six hundred forty-four thousand, five hundred eighty-seven".