166157557172603 has 2 divisors, whose sum is σ = 166157557172604. Its totient is φ = 166157557172602.

The previous prime is 166157557172569. The next prime is 166157557172609. The reversal of 166157557172603 is 306271755751661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166157557172603 is a prime.

It is not a weakly prime, because it can be changed into another prime (166157557172609) 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, 83078778586301 + 83078778586302.

It is an arithmetic number, because the mean of its divisors is an integer number (83078778586302).

Almost surely, 2^{166157557172603} is an apocalyptic number.

166157557172603 is a deficient number, since it is larger than the sum of its proper divisors (1).

166157557172603 is an equidigital number, since it uses as much as digits as its factorization.

166157557172603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55566000, while the sum is 62.

The spelling of 166157557172603 in words is "one hundred sixty-six trillion, one hundred fifty-seven billion, five hundred fifty-seven million, one hundred seventy-two thousand, six hundred three".