13845610657 has 4 divisors (see below), whose sum is σ = 13853565076. Its totient is φ = 13837656240.

The previous prime is 13845610613. The next prime is 13845610673. The reversal of 13845610657 is 75601654831.

It is a happy number.

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 871489441 + 12974121216 = 29521^2 + 113904^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13845610657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13845610607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3974598 + ... + 3978079.

It is an arithmetic number, because the mean of its divisors is an integer number (3463391269).

Almost surely, 2^13845610657 is an apocalyptic number.

It is an amenable number.

13845610657 is a deficient number, since it is larger than the sum of its proper divisors (7954419).

13845610657 is an equidigital number, since it uses as much as digits as its factorization.

13845610657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7954418.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 13845610657 in words is "thirteen billion, eight hundred forty-five million, six hundred ten thousand, six hundred fifty-seven".