1131563642665 has 4 divisors (see below), whose sum is σ = 1357876371204. Its totient is φ = 905250914128.

The previous prime is 1131563642639. The next prime is 1131563642719. The reversal of 1131563642665 is 5662463651311.

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 817322675481 + 314240967184 = 904059^2 + 560572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131563642665 - 2⁵ = 1131563642633 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113156364262 + ... + 113156364271.

It is an arithmetic number, because the mean of its divisors is an integer number (339469092801).

Almost surely, 2^{1131563642665} is an apocalyptic number.

It is an amenable number.

1131563642665 is a deficient number, since it is larger than the sum of its proper divisors (226312728539).

1131563642665 is an equidigital number, since it uses as much as digits as its factorization.

1131563642665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226312728538.

The product of its digits is 2332800, while the sum is 49.

The spelling of 1131563642665 in words is "one trillion, one hundred thirty-one billion, five hundred sixty-three million, six hundred forty-two thousand, six hundred sixty-five".