12662891961 has 8 divisors (see below), whose sum is σ = 17121657024. Its totient is φ = 8323027440.

The previous prime is 12662891959. The next prime is 12662891999. The reversal of 12662891961 is 16919826621.

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

It is not a de Polignac number, because 12662891961 - 2¹ = 12662891959 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12662891561) 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, 29724886 + ... + 29725311.

It is an arithmetic number, because the mean of its divisors is an integer number (2140207128).

Almost surely, 2^12662891961 is an apocalyptic number.

It is an amenable number.

12662891961 is a deficient number, since it is larger than the sum of its proper divisors (4458765063).

12662891961 is an equidigital number, since it uses as much as digits as its factorization.

12662891961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59450271.

The product of its digits is 559872, while the sum is 51.

The spelling of 12662891961 in words is "twelve billion, six hundred sixty-two million, eight hundred ninety-one thousand, nine hundred sixty-one".