3256621649 has 2 divisors, whose sum is σ = 3256621650. Its totient is φ = 3256621648.

The previous prime is 3256621639. The next prime is 3256621721. The reversal of 3256621649 is 9461266523.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2804761600 + 451860049 = 52960^2 + 21257^2 .

It is a cyclic number.

It is not a de Polignac number, because 3256621649 - 2⁴ = 3256621633 is a prime.

It is not a weakly prime, because it can be changed into another prime (3256621619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1628310824 + 1628310825.

It is an arithmetic number, because the mean of its divisors is an integer number (1628310825).

Almost surely, 2^3256621649 is an apocalyptic number.

It is an amenable number.

3256621649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3256621649 is an equidigital number, since it uses as much as digits as its factorization.

3256621649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 3256621649 is about 57066.8174073165. The cubic root of 3256621649 is about 1482.2533317266.

The spelling of 3256621649 in words is "three billion, two hundred fifty-six million, six hundred twenty-one thousand, six hundred forty-nine".