11511506005 has 4 divisors (see below), whose sum is σ = 13813807212. Its totient is φ = 9209204800.

The previous prime is 11511505997. The next prime is 11511506033. The reversal of 11511506005 is 50060511511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50060511511 = 14723 ⋅3400157.

It can be written as a sum of positive squares in 2 ways, for example, as 3394577169 + 8116928836 = 58263^2 + 90094^2 .

It is not a de Polignac number, because 11511506005 - 2³ = 11511505997 is a prime.

It is a super-3 number, since 3×11511506005³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151150596 + ... + 1151150605.

It is an arithmetic number, because the mean of its divisors is an integer number (3453451803).

Almost surely, 2^11511506005 is an apocalyptic number.

It is an amenable number.

11511506005 is a deficient number, since it is larger than the sum of its proper divisors (2302301207).

11511506005 is an equidigital number, since it uses as much as digits as its factorization.

11511506005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302301206.

The product of its (nonzero) digits is 750, while the sum is 25.

The spelling of 11511506005 in words is "eleven billion, five hundred eleven million, five hundred six thousand, five".