816532643 has 2 divisors, whose sum is σ = 816532644. Its totient is φ = 816532642.

The previous prime is 816532601. The next prime is 816532649. The reversal of 816532643 is 346235618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816532643 - 2⁶ = 816532579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 816532597 and 816532606.

It is not a weakly prime, because it can be changed into another prime (816532649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408266321 + 408266322.

It is an arithmetic number, because the mean of its divisors is an integer number (408266322).

Almost surely, 2^816532643 is an apocalyptic number.

816532643 is a deficient number, since it is larger than the sum of its proper divisors (1).

816532643 is an equidigital number, since it uses as much as digits as its factorization.

816532643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 38.

The square root of 816532643 is about 28575.0353105644. The cubic root of 816532643 is about 934.6690252374.

The spelling of 816532643 in words is "eight hundred sixteen million, five hundred thirty-two thousand, six hundred forty-three".