11506566 has 16 divisors (see below), whose sum is σ = 23229504. Its totient is φ = 3799464.

The previous prime is 11506541. The next prime is 11506567. The reversal of 11506566 is 66560511.

It is a super-2 number, since 2×11506566² = 264802122224712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11506567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8320 + ... + 9603.

It is an arithmetic number, because the mean of its divisors is an integer number (1451844).

Almost surely, 2^11506566 is an apocalyptic number.

11506566 is an abundant number, since it is smaller than the sum of its proper divisors (11722938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11506566 is a wasteful number, since it uses less digits than its factorization.

11506566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18035.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 11506566 is about 3392.1329572999. The cubic root of 11506566 is about 225.7608219642.

The spelling of 11506566 in words is "eleven million, five hundred six thousand, five hundred sixty-six".