656468191 has 2 divisors, whose sum is σ = 656468192. Its totient is φ = 656468190.

The previous prime is 656468177. The next prime is 656468213. The reversal of 656468191 is 191864656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656468191 - 2¹⁷ = 656337119 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656468101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328234095 + 328234096.

It is an arithmetic number, because the mean of its divisors is an integer number (328234096).

Almost surely, 2^656468191 is an apocalyptic number.

656468191 is a deficient number, since it is larger than the sum of its proper divisors (1).

656468191 is an equidigital number, since it uses as much as digits as its factorization.

656468191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 656468191 is about 25621.6352132334. The cubic root of 656468191 is about 869.1029601028.

It can be divided in two parts, 65646 and 8191, that added together give a palindrome (73837).

The spelling of 656468191 in words is "six hundred fifty-six million, four hundred sixty-eight thousand, one hundred ninety-one".