6506636551 has 2 divisors, whose sum is σ = 6506636552. Its totient is φ = 6506636550.

The previous prime is 6506636537. The next prime is 6506636557. The reversal of 6506636551 is 1556366056.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6506636551 - 2¹⁷ = 6506505479 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6506636498 and 6506636507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6506636557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253318275 + 3253318276.

It is an arithmetic number, because the mean of its divisors is an integer number (3253318276).

Almost surely, 2^6506636551 is an apocalyptic number.

6506636551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506636551 is an equidigital number, since it uses as much as digits as its factorization.

6506636551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 43.

The square root of 6506636551 is about 80663.7251247424. The cubic root of 6506636551 is about 1866.8905162283.

The spelling of 6506636551 in words is "six billion, five hundred six million, six hundred thirty-six thousand, five hundred fifty-one".