11238766865 has 48 divisors (see below), whose sum is σ = 14588244720. Its totient is φ = 8297103360.

The previous prime is 11238766849. The next prime is 11238766907. The reversal of 11238766865 is 56866783211.

It can be written as a sum of positive squares in 24 ways, for example, as 7809610384 + 3429156481 = 88372^2 + 58559^2 .

It is not a de Polignac number, because 11238766865 - 2⁴ = 11238766849 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16699169 + ... + 16699841.

It is an arithmetic number, because the mean of its divisors is an integer number (303921765).

Almost surely, 2^11238766865 is an apocalyptic number.

It is an amenable number.

11238766865 is a deficient number, since it is larger than the sum of its proper divisors (3349477855).

11238766865 is an equidigital number, since it uses as much as digits as its factorization.

11238766865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 801 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 53.

The spelling of 11238766865 in words is "eleven billion, two hundred thirty-eight million, seven hundred sixty-six thousand, eight hundred sixty-five".