6516605551 has 2 divisors, whose sum is σ = 6516605552. Its totient is φ = 6516605550.

The previous prime is 6516605531. The next prime is 6516605569. The reversal of 6516605551 is 1555066156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6516605551 - 2²⁹ = 5979734639 is a prime.

It is a super-2 number, since 2×6516605551² = 84932295814648027202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6516605531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258302775 + 3258302776.

It is an arithmetic number, because the mean of its divisors is an integer number (3258302776).

Almost surely, 2^6516605551 is an apocalyptic number.

6516605551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516605551 is an equidigital number, since it uses as much as digits as its factorization.

6516605551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 6516605551 is about 80725.4950495815. The cubic root of 6516605551 is about 1867.8434681190.

It can be divided in two parts, 6516605 and 551, that added together give a palindrome (6517156).

The spelling of 6516605551 in words is "six billion, five hundred sixteen million, six hundred five thousand, five hundred fifty-one".