11521503225 has 72 divisors (see below), whose sum is σ = 20845819800. Its totient is φ = 6082728960.

The previous prime is 11521503187. The next prime is 11521503263. The reversal of 11521503225 is 52230512511.

11521503225 is a `hidden beast` number, since 1 + 152 + 1 + 503 + 2 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (11521503187) and next prime (11521503263).

It can be written as a sum of positive squares in 12 ways, for example, as 10709766144 + 811737081 = 103488^2 + 28491^2 .

It is not a de Polignac number, because 11521503225 - 2⁸ = 11521502969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 18673117 + ... + 18673733.

It is an arithmetic number, because the mean of its divisors is an integer number (289525275).

Almost surely, 2^11521503225 is an apocalyptic number.

11521503225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11521503225 is a deficient number, since it is larger than the sum of its proper divisors (9324316575).

11521503225 is a wasteful number, since it uses less digits than its factorization.

11521503225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339 (or 1331 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 11521503225 in words is "eleven billion, five hundred twenty-one million, five hundred three thousand, two hundred twenty-five".