11547567661 has 8 divisors (see below), whose sum is σ = 13891810880. Its totient is φ = 9376972128.

The previous prime is 11547567649. The next prime is 11547567683. The reversal of 11547567661 is 16676574511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11547567661 - 2¹⁵ = 11547534893 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 (11547567641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43411776 + ... + 43412041.

It is an arithmetic number, because the mean of its divisors is an integer number (1736476360).

Almost surely, 2^11547567661 is an apocalyptic number.

It is an amenable number.

11547567661 is a deficient number, since it is larger than the sum of its proper divisors (2344243219).

11547567661 is an equidigital number, since it uses as much as digits as its factorization.

11547567661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86823843.

The product of its digits is 1058400, while the sum is 49.

The spelling of 11547567661 in words is "eleven billion, five hundred forty-seven million, five hundred sixty-seven thousand, six hundred sixty-one".