166542877 has 2 divisors, whose sum is σ = 166542878. Its totient is φ = 166542876.

The previous prime is 166542869. The next prime is 166542917. The reversal of 166542877 is 778245661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150454756 + 16088121 = 12266^2 + 4011^2 .

It is a cyclic number.

It is not a de Polignac number, because 166542877 - 2³ = 166542869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166542577) 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, 83271438 + 83271439.

It is an arithmetic number, because the mean of its divisors is an integer number (83271439).

Almost surely, 2^166542877 is an apocalyptic number.

It is an amenable number.

166542877 is a deficient number, since it is larger than the sum of its proper divisors (1).

166542877 is an equidigital number, since it uses as much as digits as its factorization.

166542877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 46.

The square root of 166542877 is about 12905.1492436159. The cubic root of 166542877 is about 550.1849262451.

The spelling of 166542877 in words is "one hundred sixty-six million, five hundred forty-two thousand, eight hundred seventy-seven".