262191216649 has 2 divisors, whose sum is σ = 262191216650. Its totient is φ = 262191216648.

The previous prime is 262191216641. The next prime is 262191216659. The reversal of 262191216649 is 946612191262.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254858377225 + 7332839424 = 504835^2 + 85632^2 .

It is a cyclic number.

It is not a de Polignac number, because 262191216649 - 2³ = 262191216641 is a prime.

It is not a weakly prime, because it can be changed into another prime (262191216641) 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, 131095608324 + 131095608325.

It is an arithmetic number, because the mean of its divisors is an integer number (131095608325).

Almost surely, 2^262191216649 is an apocalyptic number.

It is an amenable number.

262191216649 is a deficient number, since it is larger than the sum of its proper divisors (1).

262191216649 is an equidigital number, since it uses as much as digits as its factorization.

262191216649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 49.

The spelling of 262191216649 in words is "two hundred sixty-two billion, one hundred ninety-one million, two hundred sixteen thousand, six hundred forty-nine".