1687166867 has 2 divisors, whose sum is σ = 1687166868. Its totient is φ = 1687166866.

The previous prime is 1687166809. The next prime is 1687166869. The reversal of 1687166867 is 7686617861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1687166867 - 2²⁸ = 1418731411 is a prime.

Together with 1687166869, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1687166869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843583433 + 843583434.

It is an arithmetic number, because the mean of its divisors is an integer number (843583434).

Almost surely, 2^1687166867 is an apocalyptic number.

1687166867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687166867 is an equidigital number, since it uses as much as digits as its factorization.

1687166867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 56.

The square root of 1687166867 is about 41075.1368470027. The cubic root of 1687166867 is about 1190.4724407574.

It can be divided in two parts, 16871 and 66867, that added together give a palindrome (83738).

The spelling of 1687166867 in words is "one billion, six hundred eighty-seven million, one hundred sixty-six thousand, eight hundred sixty-seven".