667071623 has 2 divisors, whose sum is σ = 667071624. Its totient is φ = 667071622.

The previous prime is 667071577. The next prime is 667071689. The reversal of 667071623 is 326170766.

667071623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667071623 - 2²⁰ = 666023047 is a prime.

It is equal to p_34634378 and since 667071623 and 34634378 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667070623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333535811 + 333535812.

It is an arithmetic number, because the mean of its divisors is an integer number (333535812).

Almost surely, 2^667071623 is an apocalyptic number.

667071623 is a deficient number, since it is larger than the sum of its proper divisors (1).

667071623 is an equidigital number, since it uses as much as digits as its factorization.

667071623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 667071623 is about 25827.7297298853. The cubic root of 667071623 is about 873.7573099048.

The spelling of 667071623 in words is "six hundred sixty-seven million, seventy-one thousand, six hundred twenty-three".