6506158081 has 2 divisors, whose sum is σ = 6506158082. Its totient is φ = 6506158080.

The previous prime is 6506158073. The next prime is 6506158121. The reversal of 6506158081 is 1808516056.

It is an a-pointer prime, because the next prime (6506158121) can be obtained adding 6506158081 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3854423056 + 2651735025 = 62084^2 + 51495^2 .

It is a cyclic number.

It is not a de Polignac number, because 6506158081 - 2³ = 6506158073 is a prime.

It is a super-2 number, since 2×6506158081² = 84660185949923205122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6506150081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253079040 + 3253079041.

It is an arithmetic number, because the mean of its divisors is an integer number (3253079041).

Almost surely, 2^6506158081 is an apocalyptic number.

It is an amenable number.

6506158081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506158081 is an equidigital number, since it uses as much as digits as its factorization.

6506158081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 6506158081 is about 80660.7592389261. The cubic root of 6506158081 is about 1866.8447540799.

The spelling of 6506158081 in words is "six billion, five hundred six million, one hundred fifty-eight thousand, eighty-one".