11512101505 has 4 divisors (see below), whose sum is σ = 13814521812. Its totient is φ = 9209681200.

The previous prime is 11512101481. The next prime is 11512101529. The reversal of 11512101505 is 50510121511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50510121511 = 6763 ⋅7468597.

It is an interprime number because it is at equal distance from previous prime (11512101481) and next prime (11512101529).

It can be written as a sum of positive squares in 2 ways, for example, as 8545338481 + 2966763024 = 92441^2 + 54468^2 .

It is a de Polignac number, because none of the positive numbers 2^k-11512101505 is a prime.

It is a super-2 number, since 2×11512101505² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (22) 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151210146 + ... + 1151210155.

It is an arithmetic number, because the mean of its divisors is an integer number (3453630453).

Almost surely, 2^11512101505 is an apocalyptic number.

It is an amenable number.

11512101505 is a deficient number, since it is larger than the sum of its proper divisors (2302420307).

11512101505 is an equidigital number, since it uses as much as digits as its factorization.

11512101505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302420306.

The product of its (nonzero) digits is 250, while the sum is 22.

The spelling of 11512101505 in words is "eleven billion, five hundred twelve million, one hundred one thousand, five hundred five".