816632693 has 2 divisors, whose sum is σ = 816632694. Its totient is φ = 816632692.

The previous prime is 816632683. The next prime is 816632701. The reversal of 816632693 is 396236618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 728892004 + 87740689 = 26998^2 + 9367^2 .

It is a cyclic number.

It is not a de Polignac number, because 816632693 - 2¹² = 816628597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816632623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408316346 + 408316347.

It is an arithmetic number, because the mean of its divisors is an integer number (408316347).

Almost surely, 2^816632693 is an apocalyptic number.

It is an amenable number.

816632693 is a deficient number, since it is larger than the sum of its proper divisors (1).

816632693 is an equidigital number, since it uses as much as digits as its factorization.

816632693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 816632693 is about 28576.7859109453. The cubic root of 816632693 is about 934.7071987743.

The spelling of 816632693 in words is "eight hundred sixteen million, six hundred thirty-two thousand, six hundred ninety-three".