667608523 has 2 divisors, whose sum is σ = 667608524. Its totient is φ = 667608522.

The previous prime is 667608463. The next prime is 667608559. The reversal of 667608523 is 325806766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667608523 - 2¹³ = 667600331 is a prime.

It is a super-2 number, since 2×667608523² = 891402279964483058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667608523.

It is not a weakly prime, because it can be changed into another prime (667608563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333804261 + 333804262.

It is an arithmetic number, because the mean of its divisors is an integer number (333804262).

Almost surely, 2^667608523 is an apocalyptic number.

667608523 is a deficient number, since it is larger than the sum of its proper divisors (1).

667608523 is an equidigital number, since it uses as much as digits as its factorization.

667608523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 667608523 is about 25838.1215067969. The cubic root of 667608523 is about 873.9916647981.

The spelling of 667608523 in words is "six hundred sixty-seven million, six hundred eight thousand, five hundred twenty-three".