863651880857 has 2 divisors, whose sum is σ = 863651880858. Its totient is φ = 863651880856.

The previous prime is 863651880683. The next prime is 863651880901. The reversal of 863651880857 is 758088156368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617778708121 + 245873172736 = 785989^2 + 495856^2 .

It is a cyclic number.

It is not a de Polignac number, because 863651880857 - 2¹⁰ = 863651879833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 863651880793 and 863651880802.

It is not a weakly prime, because it can be changed into another prime (863651882857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431825940428 + 431825940429.

It is an arithmetic number, because the mean of its divisors is an integer number (431825940429).

Almost surely, 2^863651880857 is an apocalyptic number.

It is an amenable number.

863651880857 is a deficient number, since it is larger than the sum of its proper divisors (1).

863651880857 is an equidigital number, since it uses as much as digits as its factorization.

863651880857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77414400, while the sum is 65.

The spelling of 863651880857 in words is "eight hundred sixty-three billion, six hundred fifty-one million, eight hundred eighty thousand, eight hundred fifty-seven".