12665052101 has 4 divisors (see below), whose sum is σ = 13639286892. Its totient is φ = 11690817312.

The previous prime is 12665052089. The next prime is 12665052149. The reversal of 12665052101 is 10125056621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10125056621 = 251 ⋅40338871.

It can be written as a sum of positive squares in 2 ways, for example, as 8258083876 + 4406968225 = 90874^2 + 66385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12665052101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665052181) 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, 487117376 + ... + 487117401.

It is an arithmetic number, because the mean of its divisors is an integer number (3409821723).

Almost surely, 2^12665052101 is an apocalyptic number.

It is an amenable number.

12665052101 is a deficient number, since it is larger than the sum of its proper divisors (974234791).

12665052101 is an equidigital number, since it uses as much as digits as its factorization.

12665052101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974234790.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 12665052101 in words is "twelve billion, six hundred sixty-five million, fifty-two thousand, one hundred one".