667542287 has 2 divisors, whose sum is σ = 667542288. Its totient is φ = 667542286.

The previous prime is 667542241. The next prime is 667542289. The reversal of 667542287 is 782245766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667542287 - 2⁶ = 667542223 is a prime.

It is a super-2 number, since 2×667542287² = 891225409866380738, which contains 22 as substring.

Together with 667542289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667542289) 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, 333771143 + 333771144.

It is an arithmetic number, because the mean of its divisors is an integer number (333771144).

Almost surely, 2^667542287 is an apocalyptic number.

667542287 is a deficient number, since it is larger than the sum of its proper divisors (1).

667542287 is an equidigital number, since it uses as much as digits as its factorization.

667542287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 47.

The square root of 667542287 is about 25836.8397254773. The cubic root of 667542287 is about 873.9627598213.

The spelling of 667542287 in words is "six hundred sixty-seven million, five hundred forty-two thousand, two hundred eighty-seven".