166838687 has 2 divisors, whose sum is σ = 166838688. Its totient is φ = 166838686.

The previous prime is 166838669. The next prime is 166838713. The reversal of 166838687 is 786838661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166838687 - 2⁸ = 166838431 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166838627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83419343 + 83419344.

It is an arithmetic number, because the mean of its divisors is an integer number (83419344).

Almost surely, 2^166838687 is an apocalyptic number.

166838687 is a deficient number, since it is larger than the sum of its proper divisors (1).

166838687 is an equidigital number, since it uses as much as digits as its factorization.

166838687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 53.

The square root of 166838687 is about 12916.6050880253. The cubic root of 166838687 is about 550.5104759236.

The spelling of 166838687 in words is "one hundred sixty-six million, eight hundred thirty-eight thousand, six hundred eighty-seven".