6845208581 has 2 divisors, whose sum is σ = 6845208582. Its totient is φ = 6845208580.

The previous prime is 6845208563. The next prime is 6845208599. The reversal of 6845208581 is 1858025486.

It is a balanced prime because it is at equal distance from previous prime (6845208563) and next prime (6845208599).

It can be written as a sum of positive squares in only one way, i.e., 6696148900 + 149059681 = 81830^2 + 12209^2 .

It is a cyclic number.

It is not a de Polignac number, because 6845208581 - 2¹⁴ = 6845192197 is a prime.

It is a super-2 number, since 2×6845208581² = 93713761034792067122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6845208541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3422604290 + 3422604291.

It is an arithmetic number, because the mean of its divisors is an integer number (3422604291).

Almost surely, 2^6845208581 is an apocalyptic number.

It is an amenable number.

6845208581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6845208581 is an equidigital number, since it uses as much as digits as its factorization.

6845208581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 614400, while the sum is 47.

The square root of 6845208581 is about 82735.7757019296. The cubic root of 6845208581 is about 1898.7256996467.

The spelling of 6845208581 in words is "six billion, eight hundred forty-five million, two hundred eight thousand, five hundred eighty-one".