11666515655560 has 32 divisors (see below), whose sum is σ = 26249805451800. Its totient is φ = 4666580444160.

The previous prime is 11666515655527. The next prime is 11666515655567. The reversal of 11666515655560 is 6555651566611.

It can be written as a sum of positive squares in 4 ways, for example, as 6960384168516 + 4706131487044 = 2638254^2 + 2169362^2 .

It is a super-2 number, since 2×11666515655560² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11666515655495 and 11666515655504.

It is not an unprimeable number, because it can be changed into a prime (11666515655567) 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, 7593250 + ... + 8999470.

Almost surely, 2^{11666515655560} is an apocalyptic number.

11666515655560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11666515655560 is an abundant number, since it is smaller than the sum of its proper divisors (14583289796240).

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

11666515655560 is a wasteful number, since it uses less digits than its factorization.

11666515655560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613641 (or 1613637 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 58.

The spelling of 11666515655560 in words is "eleven trillion, six hundred sixty-six billion, five hundred fifteen million, six hundred fifty-five thousand, five hundred sixty".