668701487 has 2 divisors, whose sum is σ = 668701488. Its totient is φ = 668701486.

The previous prime is 668701393. The next prime is 668701489. The reversal of 668701487 is 784107866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668701487 - 2¹⁰ = 668700463 is a prime.

It is a super-2 number, since 2×668701487² = 894323357432022338, which contains 22 as substring.

Together with 668701489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668701489) 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, 334350743 + 334350744.

It is an arithmetic number, because the mean of its divisors is an integer number (334350744).

Almost surely, 2^668701487 is an apocalyptic number.

668701487 is a deficient number, since it is larger than the sum of its proper divisors (1).

668701487 is an equidigital number, since it uses as much as digits as its factorization.

668701487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 668701487 is about 25859.2630792140. The cubic root of 668701487 is about 874.4683516491.

The spelling of 668701487 in words is "six hundred sixty-eight million, seven hundred one thousand, four hundred eighty-seven".