166003639057 has 2 divisors, whose sum is σ = 166003639058. Its totient is φ = 166003639056.

The previous prime is 166003638973. The next prime is 166003639091. The reversal of 166003639057 is 750936300661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137545298641 + 28458340416 = 370871^2 + 168696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166003639057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166003638998 and 166003639016.

It is not a weakly prime, because it can be changed into another prime (166003639097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83001819528 + 83001819529.

It is an arithmetic number, because the mean of its divisors is an integer number (83001819529).

Almost surely, 2^166003639057 is an apocalyptic number.

It is an amenable number.

166003639057 is a deficient number, since it is larger than the sum of its proper divisors (1).

166003639057 is an equidigital number, since it uses as much as digits as its factorization.

166003639057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 46.

The spelling of 166003639057 in words is "one hundred sixty-six billion, three million, six hundred thirty-nine thousand, fifty-seven".