3216765649 has 2 divisors, whose sum is σ = 3216765650. Its totient is φ = 3216765648.

The previous prime is 3216765631. The next prime is 3216765677. The reversal of 3216765649 is 9465676123.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1632725649 + 1584040000 = 40407^2 + 39800^2 .

It is an emirp because it is prime and its reverse (9465676123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3216765649 - 2¹⁵ = 3216732881 is a prime.

It is not a weakly prime, because it can be changed into another prime (3216765749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1608382824 + 1608382825.

It is an arithmetic number, because the mean of its divisors is an integer number (1608382825).

Almost surely, 2^3216765649 is an apocalyptic number.

It is an amenable number.

3216765649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3216765649 is an equidigital number, since it uses as much as digits as its factorization.

3216765649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 49.

The square root of 3216765649 is about 56716.5377028605. The cubic root of 3216765649 is about 1476.1816671160.

The spelling of 3216765649 in words is "three billion, two hundred sixteen million, seven hundred sixty-five thousand, six hundred forty-nine".