8189475857 has 2 divisors, whose sum is σ = 8189475858. Its totient is φ = 8189475856.

The previous prime is 8189475839. The next prime is 8189475869. The reversal of 8189475857 is 7585749818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7271143441 + 918332416 = 85271^2 + 30304^2 .

It is a cyclic number.

It is not a de Polignac number, because 8189475857 - 2⁸ = 8189475601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8189475857.

It is not a weakly prime, because it can be changed into another prime (8189475257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4094737928 + 4094737929.

It is an arithmetic number, because the mean of its divisors is an integer number (4094737929).

Almost surely, 2^8189475857 is an apocalyptic number.

It is an amenable number.

8189475857 is a deficient number, since it is larger than the sum of its proper divisors (1).

8189475857 is an equidigital number, since it uses as much as digits as its factorization.

8189475857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22579200, while the sum is 62.

The square root of 8189475857 is about 90495.7228657797. The cubic root of 8189475857 is about 2015.6666129316. Note that the first 4 decimals are identical.

It can be divided in two parts, 81894 and 75857, that added together give a palindrome (157751).

The spelling of 8189475857 in words is "eight billion, one hundred eighty-nine million, four hundred seventy-five thousand, eight hundred fifty-seven".