6557905649 has 2 divisors, whose sum is σ = 6557905650. Its totient is φ = 6557905648.

The previous prime is 6557905583. The next prime is 6557905709. The reversal of 6557905649 is 9465097556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4811919424 + 1745986225 = 69368^2 + 41785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6557905649 is a prime.

It is a super-2 number, since 2×6557905649² = 86012253002372222402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6557905594 and 6557905603.

It is not a weakly prime, because it can be changed into another prime (6557935649) 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, 3278952824 + 3278952825.

It is an arithmetic number, because the mean of its divisors is an integer number (3278952825).

Almost surely, 2^6557905649 is an apocalyptic number.

It is an amenable number.

6557905649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6557905649 is an equidigital number, since it uses as much as digits as its factorization.

6557905649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206000, while the sum is 56.

The square root of 6557905649 is about 80980.8968152366. The cubic root of 6557905649 is about 1871.7810867640.

The spelling of 6557905649 in words is "six billion, five hundred fifty-seven million, nine hundred five thousand, six hundred forty-nine".