668723527 has 2 divisors, whose sum is σ = 668723528. Its totient is φ = 668723526.

The previous prime is 668723507. The next prime is 668723593. The reversal of 668723527 is 725327866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668723527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668723507) 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, 334361763 + 334361764.

It is an arithmetic number, because the mean of its divisors is an integer number (334361764).

Almost surely, 2^668723527 is an apocalyptic number.

668723527 is a deficient number, since it is larger than the sum of its proper divisors (1).

668723527 is an equidigital number, since it uses as much as digits as its factorization.

668723527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 46.

The square root of 668723527 is about 25859.6892286044. The cubic root of 668723527 is about 874.4779588611.

The spelling of 668723527 in words is "six hundred sixty-eight million, seven hundred twenty-three thousand, five hundred twenty-seven".