11665571 has 8 divisors (see below), whose sum is σ = 11925840. Its totient is φ = 11407968.

The previous prime is 11665561. The next prime is 11665573. The reversal of 11665571 is 17556611.

11665571 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 11665571 - 2¹⁰ = 11664547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11665573) 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, 9965 + ... + 11073.

It is an arithmetic number, because the mean of its divisors is an integer number (1490730).

Almost surely, 2^11665571 is an apocalyptic number.

11665571 is a deficient number, since it is larger than the sum of its proper divisors (260269).

11665571 is a wasteful number, since it uses less digits than its factorization.

11665571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333.

The product of its digits is 6300, while the sum is 32.

The square root of 11665571 is about 3415.4898623770. The cubic root of 11665571 is about 226.7959702934.

The spelling of 11665571 in words is "eleven million, six hundred sixty-five thousand, five hundred seventy-one".