634644362291 has 2 divisors, whose sum is σ = 634644362292. Its totient is φ = 634644362290.

The previous prime is 634644362221. The next prime is 634644362293. The reversal of 634644362291 is 192263446436.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634644362291 is a prime.

Together with 634644362293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (634644362293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317322181145 + 317322181146.

It is an arithmetic number, because the mean of its divisors is an integer number (317322181146).

Almost surely, 2^634644362291 is an apocalyptic number.

634644362291 is a deficient number, since it is larger than the sum of its proper divisors (1).

634644362291 is an equidigital number, since it uses as much as digits as its factorization.

634644362291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 50.

The spelling of 634644362291 in words is "six hundred thirty-four billion, six hundred forty-four million, three hundred sixty-two thousand, two hundred ninety-one".