6820000081 has 2 divisors, whose sum is σ = 6820000082. Its totient is φ = 6820000080.

The previous prime is 6820000073. The next prime is 6820000127. The reversal of 6820000081 is 1800000286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6786464400 + 33535681 = 82380^2 + 5791^2 .

It is a cyclic number.

It is not a de Polignac number, because 6820000081 - 2³ = 6820000073 is a prime.

It is a super-2 number, since 2×6820000081² = 93024802209680013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6820000021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410000040 + 3410000041.

It is an arithmetic number, because the mean of its divisors is an integer number (3410000041).

Almost surely, 2^6820000081 is an apocalyptic number.

It is an amenable number.

6820000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6820000081 is an equidigital number, since it uses as much as digits as its factorization.

6820000081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 6820000081 is about 82583.2917786643. The cubic root of 6820000081 is about 1896.3920525802.

The spelling of 6820000081 in words is "six billion, eight hundred twenty million, eighty-one", and thus it is an aban number.