646623114491 has 2 divisors, whose sum is σ = 646623114492. Its totient is φ = 646623114490.

The previous prime is 646623114461. The next prime is 646623114493. The reversal of 646623114491 is 194411326646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646623114491 - 2¹⁸ = 646622852347 is a prime.

It is a Sophie Germain prime.

Together with 646623114493, 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 (646623114493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323311557245 + 323311557246.

It is an arithmetic number, because the mean of its divisors is an integer number (323311557246).

Almost surely, 2^646623114491 is an apocalyptic number.

646623114491 is a deficient number, since it is larger than the sum of its proper divisors (1).

646623114491 is an equidigital number, since it uses as much as digits as its factorization.

646623114491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 47.

The spelling of 646623114491 in words is "six hundred forty-six billion, six hundred twenty-three million, one hundred fourteen thousand, four hundred ninety-one".