166055666531 has 2 divisors, whose sum is σ = 166055666532. Its totient is φ = 166055666530.

The previous prime is 166055666479. The next prime is 166055666561. The reversal of 166055666531 is 135666550661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166055666531 - 2¹⁰ = 166055665507 is a prime.

It is a super-2 number, since 2×166055666531² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166055666531.

It is not a weakly prime, because it can be changed into another prime (166055666561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83027833265 + 83027833266.

It is an arithmetic number, because the mean of its divisors is an integer number (83027833266).

Almost surely, 2^166055666531 is an apocalyptic number.

166055666531 is a deficient number, since it is larger than the sum of its proper divisors (1).

166055666531 is an equidigital number, since it uses as much as digits as its factorization.

166055666531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 166055666531 in words is "one hundred sixty-six billion, fifty-five million, six hundred sixty-six thousand, five hundred thirty-one".