6546818981 has 2 divisors, whose sum is σ = 6546818982. Its totient is φ = 6546818980.

The previous prime is 6546818939. The next prime is 6546819001. The reversal of 6546818981 is 1898186456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5566502881 + 980316100 = 74609^2 + 31310^2 .

It is a cyclic number.

It is not a de Polignac number, because 6546818981 - 2²² = 6542624677 is a prime.

It is a super-2 number, since 2×6546818981² = 85721677539963756722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6546815981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3273409490 + 3273409491.

It is an arithmetic number, because the mean of its divisors is an integer number (3273409491).

Almost surely, 2^6546818981 is an apocalyptic number.

It is an amenable number.

6546818981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6546818981 is an equidigital number, since it uses as much as digits as its factorization.

6546818981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3317760, while the sum is 56.

The square root of 6546818981 is about 80912.4154935446. The cubic root of 6546818981 is about 1870.7256928730.

The spelling of 6546818981 in words is "six billion, five hundred forty-six million, eight hundred eighteen thousand, nine hundred eighty-one".