166655501 has 2 divisors, whose sum is σ = 166655502. Its totient is φ = 166655500.

The previous prime is 166655491. The next prime is 166655507. The reversal of 166655501 is 105556661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155027401 + 11628100 = 12451^2 + 3410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166655501 is a prime.

It is a super-2 number, since 2×166655501² = 55548112027122002, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166655507) 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, 83327750 + 83327751.

It is an arithmetic number, because the mean of its divisors is an integer number (83327751).

Almost surely, 2^166655501 is an apocalyptic number.

It is an amenable number.

166655501 is a deficient number, since it is larger than the sum of its proper divisors (1).

166655501 is an equidigital number, since it uses as much as digits as its factorization.

166655501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 166655501 is about 12909.5120357045. The cubic root of 166655501 is about 550.3089184683.

The spelling of 166655501 in words is "one hundred sixty-six million, six hundred fifty-five thousand, five hundred one".