3216555649 has 2 divisors, whose sum is σ = 3216555650. Its totient is φ = 3216555648.

The previous prime is 3216555623. The next prime is 3216555653. The reversal of 3216555649 is 9465556123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2730794049 + 485761600 = 52257^2 + 22040^2 .

It is a cyclic number.

It is not a de Polignac number, because 3216555649 - 2¹¹ = 3216553601 is a prime.

It is a super-2 number, since 2×3216555649² = 20692460486227622402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3216555599 and 3216555608.

It is not a weakly prime, because it can be changed into another prime (3216555659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608277824 + 1608277825.

It is an arithmetic number, because the mean of its divisors is an integer number (1608277825).

Almost surely, 2^3216555649 is an apocalyptic number.

It is an amenable number.

3216555649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3216555649 is an equidigital number, since it uses as much as digits as its factorization.

3216555649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 46.

The square root of 3216555649 is about 56714.6863607655. The cubic root of 3216555649 is about 1476.1495432448.

The spelling of 3216555649 in words is "three billion, two hundred sixteen million, five hundred fifty-five thousand, six hundred forty-nine".