667989523 has 2 divisors, whose sum is σ = 667989524. Its totient is φ = 667989522.

The previous prime is 667989481. The next prime is 667989541. The reversal of 667989523 is 325989766.

667989523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667989523 - 2²⁵ = 634435091 is a prime.

It is not a weakly prime, because it can be changed into another prime (667983523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333994761 + 333994762.

It is an arithmetic number, because the mean of its divisors is an integer number (333994762).

Almost surely, 2^667989523 is an apocalyptic number.

667989523 is a deficient number, since it is larger than the sum of its proper divisors (1).

667989523 is an equidigital number, since it uses as much as digits as its factorization.

667989523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 55.

The square root of 667989523 is about 25845.4932821953. The cubic root of 667989523 is about 874.1578937020.

The spelling of 667989523 in words is "six hundred sixty-seven million, nine hundred eighty-nine thousand, five hundred twenty-three".