11587618261 has 4 divisors (see below), whose sum is σ = 11750824224. Its totient is φ = 11424412300.

The previous prime is 11587618249. The next prime is 11587618277. The reversal of 11587618261 is 16281678511.

11587618261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11587618261 - 2¹⁷ = 11587487189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11587612261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81602875 + ... + 81603016.

It is an arithmetic number, because the mean of its divisors is an integer number (2937706056).

Almost surely, 2^11587618261 is an apocalyptic number.

It is an amenable number.

11587618261 is a deficient number, since it is larger than the sum of its proper divisors (163205963).

11587618261 is an equidigital number, since it uses as much as digits as its factorization.

11587618261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163205962.

The product of its digits is 161280, while the sum is 46.

The spelling of 11587618261 in words is "eleven billion, five hundred eighty-seven million, six hundred eighteen thousand, two hundred sixty-one".