6518215195081 has 2 divisors, whose sum is σ = 6518215195082. Its totient is φ = 6518215195080.

The previous prime is 6518215195073. The next prime is 6518215195117. The reversal of 6518215195081 is 1805915128156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5179834605625 + 1338380589456 = 2275925^2 + 1156884^2 .

It is a cyclic number.

It is not a de Polignac number, because 6518215195081 - 2³ = 6518215195073 is a prime.

It is a super-2 number, since 2×6518215195081² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6518215145081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3259107597540 + 3259107597541.

It is an arithmetic number, because the mean of its divisors is an integer number (3259107597541).

Almost surely, 2^{6518215195081} is an apocalyptic number.

It is an amenable number.

6518215195081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6518215195081 is an equidigital number, since it uses as much as digits as its factorization.

6518215195081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864000, while the sum is 52.

The spelling of 6518215195081 in words is "six trillion, five hundred eighteen billion, two hundred fifteen million, one hundred ninety-five thousand, eighty-one".