667671523 has 2 divisors, whose sum is σ = 667671524. Its totient is φ = 667671522.

The previous prime is 667671497. The next prime is 667671541. The reversal of 667671523 is 325176766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667671523 - 2²⁹ = 130800611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667671523.

It is not a weakly prime, because it can be changed into another prime (667671223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333835761 + 333835762.

It is an arithmetic number, because the mean of its divisors is an integer number (333835762).

Almost surely, 2^667671523 is an apocalyptic number.

667671523 is a deficient number, since it is larger than the sum of its proper divisors (1).

667671523 is an equidigital number, since it uses as much as digits as its factorization.

667671523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 43.

The square root of 667671523 is about 25839.3406069118. The cubic root of 667671523 is about 874.0191558306.

The spelling of 667671523 in words is "six hundred sixty-seven million, six hundred seventy-one thousand, five hundred twenty-three".