166361687 has 2 divisors, whose sum is σ = 166361688. Its totient is φ = 166361686.

The previous prime is 166361639. The next prime is 166361729. The reversal of 166361687 is 786163661.

It is a strong prime.

It is an emirp because it is prime and its reverse (786163661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166361687 - 2⁸ = 166361431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166361627) 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, 83180843 + 83180844.

It is an arithmetic number, because the mean of its divisors is an integer number (83180844).

Almost surely, 2^166361687 is an apocalyptic number.

166361687 is a deficient number, since it is larger than the sum of its proper divisors (1).

166361687 is an equidigital number, since it uses as much as digits as its factorization.

166361687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 166361687 is about 12898.1272671656. The cubic root of 166361687 is about 549.9853296362.

The spelling of 166361687 in words is "one hundred sixty-six million, three hundred sixty-one thousand, six hundred eighty-seven".