166557803 has 2 divisors, whose sum is σ = 166557804. Its totient is φ = 166557802.

The previous prime is 166557799. The next prime is 166557841. The reversal of 166557803 is 308755661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166557803 - 2² = 166557799 is a prime.

It is not a weakly prime, because it can be changed into another prime (166559803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83278901 + 83278902.

It is an arithmetic number, because the mean of its divisors is an integer number (83278902).

Almost surely, 2^166557803 is an apocalyptic number.

166557803 is a deficient number, since it is larger than the sum of its proper divisors (1).

166557803 is an equidigital number, since it uses as much as digits as its factorization.

166557803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 166557803 is about 12905.7275269548. The cubic root of 166557803 is about 550.2013620824.

The spelling of 166557803 in words is "one hundred sixty-six million, five hundred fifty-seven thousand, eight hundred three".