11511455115 has 16 divisors (see below), whose sum is σ = 18608210208. Its totient is φ = 6076148736.

The previous prime is 11511455113. The next prime is 11511455117. The reversal of 11511455115 is 51155411511.

It is an interprime number because it is at equal distance from previous prime (11511455113) and next prime (11511455117).

It is not a de Polignac number, because 11511455115 - 2¹ = 11511455113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11511455113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3954372 + ... + 3957281.

It is an arithmetic number, because the mean of its divisors is an integer number (1163013138).

Almost surely, 2^11511455115 is an apocalyptic number.

11511455115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11511455115 is a deficient number, since it is larger than the sum of its proper divisors (7096755093).

11511455115 is an equidigital number, since it uses as much as digits as its factorization.

11511455115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911758.

The product of its digits is 2500, while the sum is 30.

Adding to 11511455115 its reverse (51155411511), we get a palindrome (62666866626).

It can be divided in two parts, 11 and 511455115, that multiplied together give a palindrome (5626006265).

The spelling of 11511455115 in words is "eleven billion, five hundred eleven million, four hundred fifty-five thousand, one hundred fifteen".