12661117562 has 8 divisors (see below), whose sum is σ = 19020762036. Its totient is φ = 6320863552.

The previous prime is 12661117559. The next prime is 12661117589. The reversal of 12661117562 is 26571116621.

It can be written as a sum of positive squares in 2 ways, for example, as 12642978481 + 18139081 = 112441^2 + 4259^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4845983 + ... + 4848594.

Almost surely, 2^12661117562 is an apocalyptic number.

12661117562 is a deficient number, since it is larger than the sum of its proper divisors (6359644474).

12661117562 is an equidigital number, since it uses as much as digits as its factorization.

12661117562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695232.

The product of its digits is 30240, while the sum is 38.

The spelling of 12661117562 in words is "twelve billion, six hundred sixty-one million, one hundred seventeen thousand, five hundred sixty-two".