6651551839 has 2 divisors, whose sum is σ = 6651551840. Its totient is φ = 6651551838.

The previous prime is 6651551833. The next prime is 6651551891. The reversal of 6651551839 is 9381551566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6651551839 - 2⁹ = 6651551327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6651551792 and 6651551801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6651551833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325775919 + 3325775920.

It is an arithmetic number, because the mean of its divisors is an integer number (3325775920).

Almost surely, 2^6651551839 is an apocalyptic number.

6651551839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651551839 is an equidigital number, since it uses as much as digits as its factorization.

6651551839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 49.

The square root of 6651551839 is about 81557.0465318601. The cubic root of 6651551839 is about 1880.6486217295.

The spelling of 6651551839 in words is "six billion, six hundred fifty-one million, five hundred fifty-one thousand, eight hundred thirty-nine".