13265616857 has 4 divisors (see below), whose sum is σ = 13273842660. Its totient is φ = 13257391056.

The previous prime is 13265616829. The next prime is 13265616877. The reversal of 13265616857 is 75861656231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9577362496 + 3688254361 = 97864^2 + 60731^2 .

It is a cyclic number.

It is not a de Polignac number, because 13265616857 - 2¹² = 13265612761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13265616877) 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, 4110482 + ... + 4113707.

It is an arithmetic number, because the mean of its divisors is an integer number (3318460665).

Almost surely, 2^13265616857 is an apocalyptic number.

It is an amenable number.

13265616857 is a deficient number, since it is larger than the sum of its proper divisors (8225803).

13265616857 is an equidigital number, since it uses as much as digits as its factorization.

13265616857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8225802.

The product of its digits is 1814400, while the sum is 50.

The spelling of 13265616857 in words is "thirteen billion, two hundred sixty-five million, six hundred sixteen thousand, eight hundred fifty-seven".