11665566531655 has 16 divisors (see below), whose sum is σ = 14069311675200. Its totient is φ = 9285367246848.

The previous prime is 11665566531637. The next prime is 11665566531679. The reversal of 11665566531655 is 55613566556611.

It is a cyclic number.

It is not a de Polignac number, because 11665566531655 - 2¹⁷ = 11665566400583 is a prime.

It is a super-2 number, since 2×11665566531655² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11665566531593 and 11665566531602.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 68563069 + ... + 68733001.

It is an arithmetic number, because the mean of its divisors is an integer number (879331979700).

Almost surely, 2^{11665566531655} is an apocalyptic number.

11665566531655 is a deficient number, since it is larger than the sum of its proper divisors (2403745143545).

11665566531655 is a wasteful number, since it uses less digits than its factorization.

11665566531655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239130.

The product of its digits is 72900000, while the sum is 61.

The spelling of 11665566531655 in words is "eleven trillion, six hundred sixty-five billion, five hundred sixty-six million, five hundred thirty-one thousand, six hundred fifty-five".