11525221551 has 4 divisors (see below), whose sum is σ = 15366962072. Its totient is φ = 7683481032.

The previous prime is 11525221537. The next prime is 11525221577. The reversal of 11525221551 is 15512252511.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11525221551 - 2¹⁰ = 11525220527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11525221051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920870256 + ... + 1920870261.

It is an arithmetic number, because the mean of its divisors is an integer number (3841740518).

Almost surely, 2^11525221551 is an apocalyptic number.

11525221551 is a deficient number, since it is larger than the sum of its proper divisors (3841740521).

11525221551 is an equidigital number, since it uses as much as digits as its factorization.

11525221551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841740520.

The product of its digits is 5000, while the sum is 30.

The spelling of 11525221551 in words is "eleven billion, five hundred twenty-five million, two hundred twenty-one thousand, five hundred fifty-one".