863093916821 has 2 divisors, whose sum is σ = 863093916822. Its totient is φ = 863093916820.

The previous prime is 863093916791. The next prime is 863093916823. The reversal of 863093916821 is 128619390368.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 854792702500 + 8301214321 = 924550^2 + 91111^2 .

It is a cyclic number.

It is not a de Polignac number, because 863093916821 - 2⁶ = 863093916757 is a prime.

It is a super-2 number, since 2×863093916821² (a number of 25 digits) contains 22 as substring.

Together with 863093916823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863093916823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431546958410 + 431546958411.

It is an arithmetic number, because the mean of its divisors is an integer number (431546958411).

Almost surely, 2^863093916821 is an apocalyptic number.

It is an amenable number.

863093916821 is a deficient number, since it is larger than the sum of its proper divisors (1).

863093916821 is an equidigital number, since it uses as much as digits as its factorization.

863093916821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The spelling of 863093916821 in words is "eight hundred sixty-three billion, ninety-three million, nine hundred sixteen thousand, eight hundred twenty-one".