166581655463 has 2 divisors, whose sum is σ = 166581655464. Its totient is φ = 166581655462.

The previous prime is 166581655447. The next prime is 166581655483. The reversal of 166581655463 is 364556185661.

It is a happy number.

166581655463 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166581655463 - 2⁴ = 166581655447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166581655399 and 166581655408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166581655403) 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 as a sum of consecutive naturals, namely, 83290827731 + 83290827732.

It is an arithmetic number, because the mean of its divisors is an integer number (83290827732).

Almost surely, 2^166581655463 is an apocalyptic number.

166581655463 is a deficient number, since it is larger than the sum of its proper divisors (1).

166581655463 is an equidigital number, since it uses as much as digits as its factorization.

166581655463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552000, while the sum is 56.

The spelling of 166581655463 in words is "one hundred sixty-six billion, five hundred eighty-one million, six hundred fifty-five thousand, four hundred sixty-three".