11547725261 has 4 divisors (see below), whose sum is σ = 11614475292. Its totient is φ = 11480975232.

The previous prime is 11547725251. The next prime is 11547725297. The reversal of 11547725261 is 16252774511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5447178025 + 6100547236 = 73805^2 + 78106^2 .

It is a cyclic number.

It is not a de Polignac number, because 11547725261 - 2¹⁸ = 11547463117 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 (11547725251) 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, 33374756 + ... + 33375101.

It is an arithmetic number, because the mean of its divisors is an integer number (2903618823).

Almost surely, 2^11547725261 is an apocalyptic number.

It is an amenable number.

11547725261 is a deficient number, since it is larger than the sum of its proper divisors (66750031).

11547725261 is an equidigital number, since it uses as much as digits as its factorization.

11547725261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66750030.

The product of its digits is 117600, while the sum is 41.

The spelling of 11547725261 in words is "eleven billion, five hundred forty-seven million, seven hundred twenty-five thousand, two hundred sixty-one".