12621661466 has 4 divisors (see below), whose sum is σ = 18932492202. Its totient is φ = 6310830732.

The previous prime is 12621661453. The next prime is 12621661489. The reversal of 12621661466 is 66416612621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7434060841 + 5187600625 = 86221^2 + 72025^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3155415365 + ... + 3155415368.

Almost surely, 2^12621661466 is an apocalyptic number.

12621661466 is a deficient number, since it is larger than the sum of its proper divisors (6310830736).

12621661466 is an equidigital number, since it uses as much as digits as its factorization.

12621661466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6310830735.

The product of its digits is 124416, while the sum is 41.

The spelling of 12621661466 in words is "twelve billion, six hundred twenty-one million, six hundred sixty-one thousand, four hundred sixty-six".