660138467 has 2 divisors, whose sum is σ = 660138468. Its totient is φ = 660138466.

The previous prime is 660138463. The next prime is 660138469. The reversal of 660138467 is 764831066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660138467 - 2² = 660138463 is a prime.

It is a super-2 number, since 2×660138467² = 871565591226220178, which contains 22 as substring.

Together with 660138469, 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 (660138461) 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, 330069233 + 330069234.

It is an arithmetic number, because the mean of its divisors is an integer number (330069234).

Almost surely, 2^660138467 is an apocalyptic number.

660138467 is a deficient number, since it is larger than the sum of its proper divisors (1).

660138467 is an equidigital number, since it uses as much as digits as its factorization.

660138467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 660138467 is about 25693.1599263306. The cubic root of 660138467 is about 870.7196524900.

The spelling of 660138467 in words is "six hundred sixty million, one hundred thirty-eight thousand, four hundred sixty-seven".