166640377 has 2 divisors, whose sum is σ = 166640378. Its totient is φ = 166640376.

The previous prime is 166640363. The next prime is 166640381. The reversal of 166640377 is 773046661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149426176 + 17214201 = 12224^2 + 4149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166640377 is a prime.

It is not a weakly prime, because it can be changed into another prime (166640977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83320188 + 83320189.

It is an arithmetic number, because the mean of its divisors is an integer number (83320189).

Almost surely, 2^166640377 is an apocalyptic number.

It is an amenable number.

166640377 is a deficient number, since it is larger than the sum of its proper divisors (1).

166640377 is an equidigital number, since it uses as much as digits as its factorization.

166640377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 166640377 is about 12908.9262527911. The cubic root of 166640377 is about 550.2922711053.

The spelling of 166640377 in words is "one hundred sixty-six million, six hundred forty thousand, three hundred seventy-seven".