11561452661 has 4 divisors (see below), whose sum is σ = 12612493824. Its totient is φ = 10510411500.

The previous prime is 11561452627. The next prime is 11561452703. The reversal of 11561452661 is 16625416511.

11561452661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11561452661 - 2¹⁴ = 11561436277 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 (11561452621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525520565 + ... + 525520586.

It is an arithmetic number, because the mean of its divisors is an integer number (3153123456).

Almost surely, 2^11561452661 is an apocalyptic number.

11561452661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11561452661 is a deficient number, since it is larger than the sum of its proper divisors (1051041163).

11561452661 is a wasteful number, since it uses less digits than its factorization.

11561452661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051041162.

The product of its digits is 43200, while the sum is 38.

The spelling of 11561452661 in words is "eleven billion, five hundred sixty-one million, four hundred fifty-two thousand, six hundred sixty-one".