11666542571887 has 32 divisors (see below), whose sum is σ = 14451855805440. Its totient is φ = 9190871539200.

The previous prime is 11666542571851. The next prime is 11666542571897. The reversal of 11666542571887 is 78817524566611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11666542571887 is a prime.

It is a super-2 number, since 2×11666542571887² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666542571897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4442028 + ... + 6562369.

It is an arithmetic number, because the mean of its divisors is an integer number (451620493920).

Almost surely, 2^{11666542571887} is an apocalyptic number.

11666542571887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11666542571887 is a deficient number, since it is larger than the sum of its proper divisors (2785313233553).

11666542571887 is a wasteful number, since it uses less digits than its factorization.

11666542571887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11004631.

The product of its digits is 135475200, while the sum is 67.

The spelling of 11666542571887 in words is "eleven trillion, six hundred sixty-six billion, five hundred forty-two million, five hundred seventy-one thousand, eight hundred eighty-seven".