6516006181 has 2 divisors, whose sum is σ = 6516006182. Its totient is φ = 6516006180.

The previous prime is 6516006121. The next prime is 6516006223. The reversal of 6516006181 is 1816006156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6461748225 + 54257956 = 80385^2 + 7366^2 .

It is a cyclic number.

It is not a de Polignac number, because 6516006181 - 2⁹ = 6516005669 is a prime.

It is a super-2 number, since 2×6516006181² = 84916673101660409522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6516006121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258003090 + 3258003091.

It is an arithmetic number, because the mean of its divisors is an integer number (3258003091).

Almost surely, 2^6516006181 is an apocalyptic number.

It is an amenable number.

6516006181 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516006181 is an equidigital number, since it uses as much as digits as its factorization.

6516006181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 6516006181 is about 80721.7825682758. The cubic root of 6516006181 is about 1867.7862008984.

The spelling of 6516006181 in words is "six billion, five hundred sixteen million, six thousand, one hundred eighty-one".