668771527 has 2 divisors, whose sum is σ = 668771528. Its totient is φ = 668771526.

The previous prime is 668771501. The next prime is 668771567. The reversal of 668771527 is 725177866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668771527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668771567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334385763 + 334385764.

It is an arithmetic number, because the mean of its divisors is an integer number (334385764).

Almost surely, 2^668771527 is an apocalyptic number.

668771527 is a deficient number, since it is larger than the sum of its proper divisors (1).

668771527 is an equidigital number, since it uses as much as digits as its factorization.

668771527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 49.

The square root of 668771527 is about 25860.6172973500. The cubic root of 668771527 is about 874.4988812782.

The spelling of 668771527 in words is "six hundred sixty-eight million, seven hundred seventy-one thousand, five hundred twenty-seven".