11561272577 has 4 divisors (see below), whose sum is σ = 11580011076. Its totient is φ = 11542534080.

The previous prime is 11561272573. The next prime is 11561272601. The reversal of 11561272577 is 77527216511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77527216511 = 122957 ⋅630523.

It can be written as a sum of positive squares in 2 ways, for example, as 697171216 + 10864101361 = 26404^2 + 104231^2 .

It is a cyclic number.

It is not a de Polignac number, because 11561272577 - 2² = 11561272573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561272573) 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, 9368324 + ... + 9369557.

It is an arithmetic number, because the mean of its divisors is an integer number (2895002769).

Almost surely, 2^11561272577 is an apocalyptic number.

It is an amenable number.

11561272577 is a deficient number, since it is larger than the sum of its proper divisors (18738499).

11561272577 is an equidigital number, since it uses as much as digits as its factorization.

11561272577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18738498.

The product of its digits is 205800, while the sum is 44.

The spelling of 11561272577 in words is "eleven billion, five hundred sixty-one million, two hundred seventy-two thousand, five hundred seventy-seven".