3656340643 has 2 divisors, whose sum is σ = 3656340644. Its totient is φ = 3656340642.

The previous prime is 3656340587. The next prime is 3656340673. The reversal of 3656340643 is 3460436563.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3656340643 - 2⁹ = 3656340131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3656340596 and 3656340605.

It is not a weakly prime, because it can be changed into another prime (3656340673) 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, 1828170321 + 1828170322.

It is an arithmetic number, because the mean of its divisors is an integer number (1828170322).

Almost surely, 2^3656340643 is an apocalyptic number.

3656340643 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656340643 is an equidigital number, since it uses as much as digits as its factorization.

3656340643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 40.

The square root of 3656340643 is about 60467.6826329569. The cubic root of 3656340643 is about 1540.5727676340.

The spelling of 3656340643 in words is "three billion, six hundred fifty-six million, three hundred forty thousand, six hundred forty-three".