8540664481 has 2 divisors, whose sum is σ = 8540664482. Its totient is φ = 8540664480.

The previous prime is 8540664463. The next prime is 8540664487. The reversal of 8540664481 is 1844660458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8508402081 + 32262400 = 92241^2 + 5680^2 .

It is a cyclic number.

It is not a de Polignac number, because 8540664481 - 2¹⁷ = 8540533409 is a prime.

It is a super-2 number, since 2×8540664481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8540664487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4270332240 + 4270332241.

It is an arithmetic number, because the mean of its divisors is an integer number (4270332241).

Almost surely, 2^8540664481 is an apocalyptic number.

It is an amenable number.

8540664481 is a deficient number, since it is larger than the sum of its proper divisors (1).

8540664481 is an equidigital number, since it uses as much as digits as its factorization.

8540664481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 737280, while the sum is 46.

The square root of 8540664481 is about 92415.7155520640. The cubic root of 8540664481 is about 2044.0768530028.

The spelling of 8540664481 in words is "eight billion, five hundred forty million, six hundred sixty-four thousand, four hundred eighty-one".