11511015057 has 10 divisors (see below), whose sum is σ = 17195467058. Its totient is φ = 7674009984.

The previous prime is 11511015053. The next prime is 11511015059. The reversal of 11511015057 is 75051011511.

It is a happy number.

11511015057 is a `hidden beast` number, since 1 + 1 + 51 + 101 + 505 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8889472656 + 2621542401 = 94284^2 + 51201^2 .

It is not a de Polignac number, because 11511015057 - 2² = 11511015053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11511015057.

It is not an unprimeable number, because it can be changed into a prime (11511015053) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 71055568 + ... + 71055729.

Almost surely, 2^11511015057 is an apocalyptic number.

It is an amenable number.

11511015057 is a deficient number, since it is larger than the sum of its proper divisors (5684452001).

11511015057 is an equidigital number, since it uses as much as digits as its factorization.

11511015057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142111309 (or 142111300 counting only the distinct ones).

The product of its (nonzero) digits is 875, while the sum is 27.

Adding to 11511015057 its reverse (75051011511), we get a palindrome (86562026568).

The spelling of 11511015057 in words is "eleven billion, five hundred eleven million, fifteen thousand, fifty-seven".