11866551 has 16 divisors (see below), whose sum is σ = 16604160. Its totient is φ = 7524000.

The previous prime is 11866549. The next prime is 11866553. The reversal of 11866551 is 15566811.

It is an interprime number because it is at equal distance from previous prime (11866549) and next prime (11866553).

It is not a de Polignac number, because 11866551 - 2¹ = 11866549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11866553) 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 15 ways as a sum of consecutive naturals, for example, 15426 + ... + 16176.

It is an arithmetic number, because the mean of its divisors is an integer number (1037760).

Almost surely, 2^11866551 is an apocalyptic number.

11866551 is a deficient number, since it is larger than the sum of its proper divisors (4737609).

11866551 is a wasteful number, since it uses less digits than its factorization.

11866551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006.

The product of its digits is 7200, while the sum is 33.

The square root of 11866551 is about 3444.7860601204. The cubic root of 11866551 is about 228.0910109116.

The spelling of 11866551 in words is "eleven million, eight hundred sixty-six thousand, five hundred fifty-one".