166557042623 has 2 divisors, whose sum is σ = 166557042624. Its totient is φ = 166557042622.

The previous prime is 166557042611. The next prime is 166557042629. The reversal of 166557042623 is 326240755661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166557042623 - 2¹⁶ = 166556977087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166557042629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83278521311 + 83278521312.

It is an arithmetic number, because the mean of its divisors is an integer number (83278521312).

Almost surely, 2^166557042623 is an apocalyptic number.

166557042623 is a deficient number, since it is larger than the sum of its proper divisors (1).

166557042623 is an equidigital number, since it uses as much as digits as its factorization.

166557042623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 166557042623 in words is "one hundred sixty-six billion, five hundred fifty-seven million, forty-two thousand, six hundred twenty-three".