668348431 has 2 divisors, whose sum is σ = 668348432. Its totient is φ = 668348430.

The previous prime is 668348407. The next prime is 668348479. The reversal of 668348431 is 134843866.

668348431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668348431 - 2⁵ = 668348399 is a prime.

It is a super-2 number, since 2×668348431² = 893379250440323522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668348491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334174215 + 334174216.

It is an arithmetic number, because the mean of its divisors is an integer number (334174216).

Almost surely, 2^668348431 is an apocalyptic number.

668348431 is a deficient number, since it is larger than the sum of its proper divisors (1).

668348431 is an equidigital number, since it uses as much as digits as its factorization.

668348431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 43.

The square root of 668348431 is about 25852.4356879579. The cubic root of 668348431 is about 874.3144261407.

The spelling of 668348431 in words is "six hundred sixty-eight million, three hundred forty-eight thousand, four hundred thirty-one".