863512815863 has 2 divisors, whose sum is σ = 863512815864. Its totient is φ = 863512815862.

The previous prime is 863512815839. The next prime is 863512815877. The reversal of 863512815863 is 368518215368.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 863512815863 - 2⁶ = 863512815799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 863512815799 and 863512815808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863512815163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431756407931 + 431756407932.

It is an arithmetic number, because the mean of its divisors is an integer number (431756407932).

Almost surely, 2^863512815863 is an apocalyptic number.

863512815863 is a deficient number, since it is larger than the sum of its proper divisors (1).

863512815863 is an equidigital number, since it uses as much as digits as its factorization.

863512815863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8294400, while the sum is 56.

The spelling of 863512815863 in words is "eight hundred sixty-three billion, five hundred twelve million, eight hundred fifteen thousand, eight hundred sixty-three".