11511151065 has 24 divisors (see below), whose sum is σ = 20020782600. Its totient is φ = 6118320384.

The previous prime is 11511151063. The next prime is 11511151079. The reversal of 11511151065 is 56015111511.

It can be written as a sum of positive squares in 4 ways, for example, as 6477674256 + 5033476809 = 80484^2 + 70947^2 .

It is not a de Polignac number, because 11511151065 - 2¹ = 11511151063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11511151063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 423340 + ... + 449709.

It is an arithmetic number, because the mean of its divisors is an integer number (834199275).

Almost surely, 2^11511151065 is an apocalyptic number.

11511151065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11511151065 is a deficient number, since it is larger than the sum of its proper divisors (8509631535).

11511151065 is a wasteful number, since it uses less digits than its factorization.

11511151065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873353 (or 873350 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 27.

Adding to 11511151065 its reverse (56015111511), we get a palindrome (67526262576).

It can be divided in two parts, 115111 and 51065, that added together give a triangular number (166176 = T₅₇₆).

The spelling of 11511151065 in words is "eleven billion, five hundred eleven million, one hundred fifty-one thousand, sixty-five".