11666160005501 has 2 divisors, whose sum is σ = 11666160005502. Its totient is φ = 11666160005500.

The previous prime is 11666160005491. The next prime is 11666160005567. The reversal of 11666160005501 is 10550006166611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7329478704601 + 4336681300900 = 2707301^2 + 2082470^2 .

It is a cyclic number.

It is not a de Polignac number, because 11666160005501 - 2¹⁴ = 11666159989117 is a prime.

It is a super-2 number, since 2×11666160005501² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11666160025501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833080002750 + 5833080002751.

It is an arithmetic number, because the mean of its divisors is an integer number (5833080002751).

Almost surely, 2^{11666160005501} is an apocalyptic number.

It is an amenable number.

11666160005501 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666160005501 is an equidigital number, since it uses as much as digits as its factorization.

11666160005501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 11666160005501 in words is "eleven trillion, six hundred sixty-six billion, one hundred sixty million, five thousand, five hundred one".