827641663 has 2 divisors, whose sum is σ = 827641664. Its totient is φ = 827641662.

The previous prime is 827641657. The next prime is 827641697. The reversal of 827641663 is 366146728.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-827641663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827641613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413820831 + 413820832.

It is an arithmetic number, because the mean of its divisors is an integer number (413820832).

Almost surely, 2^827641663 is an apocalyptic number.

827641663 is a deficient number, since it is larger than the sum of its proper divisors (1).

827641663 is an equidigital number, since it uses as much as digits as its factorization.

827641663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 43.

The square root of 827641663 is about 28768.7619302604. The cubic root of 827641663 is about 938.8887059546. Note that the first 3 decimals are identical.

The spelling of 827641663 in words is "eight hundred twenty-seven million, six hundred forty-one thousand, six hundred sixty-three".