8655421381 has 2 divisors, whose sum is σ = 8655421382. Its totient is φ = 8655421380.

The previous prime is 8655421319. The next prime is 8655421447. The reversal of 8655421381 is 1831245568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6402400225 + 2253021156 = 80015^2 + 47466^2 .

It is a cyclic number.

It is not a de Polignac number, because 8655421381 - 2¹³ = 8655413189 is a prime.

It is a super-2 number, since 2×8655421381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8655421981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4327710690 + 4327710691.

It is an arithmetic number, because the mean of its divisors is an integer number (4327710691).

Almost surely, 2^8655421381 is an apocalyptic number.

It is an amenable number.

8655421381 is a deficient number, since it is larger than the sum of its proper divisors (1).

8655421381 is an equidigital number, since it uses as much as digits as its factorization.

8655421381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 43.

The square root of 8655421381 is about 93034.5171482069. The cubic root of 8655421381 is about 2053.1912525346.

The spelling of 8655421381 in words is "eight billion, six hundred fifty-five million, four hundred twenty-one thousand, three hundred eighty-one".