11561087925 has 18 divisors (see below), whose sum is σ = 20707193442. Its totient is φ = 6165913440.

The previous prime is 11561087903. The next prime is 11561087929. The reversal of 11561087925 is 52978016511.

11561087925 is a `hidden beast` number, since 1 + 1 + 5 + 610 + 8 + 7 + 9 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 522853956 + 11038233969 = 22866^2 + 105063^2 .

It is not a de Polignac number, because 11561087925 - 2⁹ = 11561087413 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561087929) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 25691082 + ... + 25691531.

Almost surely, 2^11561087925 is an apocalyptic number.

11561087925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11561087925 is a deficient number, since it is larger than the sum of its proper divisors (9146105517).

11561087925 is a wasteful number, since it uses less digits than its factorization.

11561087925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51382629 (or 51382621 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 45.

The spelling of 11561087925 in words is "eleven billion, five hundred sixty-one million, eighty-seven thousand, nine hundred twenty-five".