667406664619 has 2 divisors, whose sum is σ = 667406664620. Its totient is φ = 667406664618.

The previous prime is 667406664601. The next prime is 667406664667. The reversal of 667406664619 is 916466604766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667406664619 - 2¹⁵ = 667406631851 is a prime.

It is a super-2 number, since 2×667406664619² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667406664019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333703332309 + 333703332310.

It is an arithmetic number, because the mean of its divisors is an integer number (333703332310).

Almost surely, 2^667406664619 is an apocalyptic number.

667406664619 is a deficient number, since it is larger than the sum of its proper divisors (1).

667406664619 is an equidigital number, since it uses as much as digits as its factorization.

667406664619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47029248, while the sum is 61.

The spelling of 667406664619 in words is "six hundred sixty-seven billion, four hundred six million, six hundred sixty-four thousand, six hundred nineteen".