3656634649 has 2 divisors, whose sum is σ = 3656634650. Its totient is φ = 3656634648.

The previous prime is 3656634647. The next prime is 3656634739. The reversal of 3656634649 is 9464366563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3392247049 + 264387600 = 58243^2 + 16260^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656634649 - 2¹ = 3656634647 is a prime.

Together with 3656634647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3656634596 and 3656634605.

It is not a weakly prime, because it can be changed into another prime (3656634647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828317324 + 1828317325.

It is an arithmetic number, because the mean of its divisors is an integer number (1828317325).

Almost surely, 2^3656634649 is an apocalyptic number.

It is an amenable number.

3656634649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656634649 is an equidigital number, since it uses as much as digits as its factorization.

3656634649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8398080, while the sum is 52.

The square root of 3656634649 is about 60470.1136843648. The cubic root of 3656634649 is about 1540.6140589633.

The spelling of 3656634649 in words is "three billion, six hundred fifty-six million, six hundred thirty-four thousand, six hundred forty-nine".