166115006557 has 2 divisors, whose sum is σ = 166115006558. Its totient is φ = 166115006556.

The previous prime is 166115006549. The next prime is 166115006581. The reversal of 166115006557 is 755600511661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121452947001 + 44662059556 = 348501^2 + 211334^2 .

It is a cyclic number.

It is not a de Polignac number, because 166115006557 - 2³ = 166115006549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166115006537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83057503278 + 83057503279.

It is an arithmetic number, because the mean of its divisors is an integer number (83057503279).

Almost surely, 2^166115006557 is an apocalyptic number.

It is an amenable number.

166115006557 is a deficient number, since it is larger than the sum of its proper divisors (1).

166115006557 is an equidigital number, since it uses as much as digits as its factorization.

166115006557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 166115006557 in words is "one hundred sixty-six billion, one hundred fifteen million, six thousand, five hundred fifty-seven".