11151215505 has 12 divisors (see below), whose sum is σ = 19328773620. Its totient is φ = 5947314912.

The previous prime is 11151215503. The next prime is 11151215513. The reversal of 11151215505 is 50551215111.

It is a happy number.

11151215505 is a `hidden beast` number, since 1 + 1 + 151 + 2 + 1 + 5 + 505 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6997155201 + 4154060304 = 83649^2 + 64452^2 .

It is not a de Polignac number, because 11151215505 - 2¹ = 11151215503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11151215503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123902350 + ... + 123902439.

It is an arithmetic number, because the mean of its divisors is an integer number (1610731135).

Almost surely, 2^11151215505 is an apocalyptic number.

11151215505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11151215505 is a deficient number, since it is larger than the sum of its proper divisors (8177558115).

11151215505 is a wasteful number, since it uses less digits than its factorization.

11151215505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247804800 (or 247804797 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 27.

The spelling of 11151215505 in words is "eleven billion, one hundred fifty-one million, two hundred fifteen thousand, five hundred five".