8378357081 has 2 divisors, whose sum is σ = 8378357082. Its totient is φ = 8378357080.

The previous prime is 8378356999. The next prime is 8378357111. The reversal of 8378357081 is 1807538738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4747210000 + 3631147081 = 68900^2 + 60259^2 .

It is a cyclic number.

It is not a de Polignac number, because 8378357081 - 2³⁰ = 7304615257 is a prime.

It is a super-2 number, since 2×8378357081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8378351081) 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, 4189178540 + 4189178541.

It is an arithmetic number, because the mean of its divisors is an integer number (4189178541).

Almost surely, 2^8378357081 is an apocalyptic number.

It is an amenable number.

8378357081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8378357081 is an equidigital number, since it uses as much as digits as its factorization.

8378357081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The square root of 8378357081 is about 91533.3659437912. The cubic root of 8378357081 is about 2031.0453561836.

The spelling of 8378357081 in words is "eight billion, three hundred seventy-eight million, three hundred fifty-seven thousand, eighty-one".