11853706565 has 4 divisors (see below), whose sum is σ = 14224447884. Its totient is φ = 9482965248.

The previous prime is 11853706549. The next prime is 11853706589. The reversal of 11853706565 is 56560735811.

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 9071038564 + 2782668001 = 95242^2 + 52751^2 .

It is a cyclic number.

It is not a de Polignac number, because 11853706565 - 2⁴ = 11853706549 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1185370652 + ... + 1185370661.

It is an arithmetic number, because the mean of its divisors is an integer number (3556111971).

Almost surely, 2^11853706565 is an apocalyptic number.

It is an amenable number.

11853706565 is a deficient number, since it is larger than the sum of its proper divisors (2370741319).

11853706565 is an equidigital number, since it uses as much as digits as its factorization.

11853706565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370741318.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 11853706565 in words is "eleven billion, eight hundred fifty-three million, seven hundred six thousand, five hundred sixty-five".