3656378993 has 2 divisors, whose sum is σ = 3656378994. Its totient is φ = 3656378992.

The previous prime is 3656378941. The next prime is 3656379031. The reversal of 3656378993 is 3998736563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3172730929 + 483648064 = 56327^2 + 21992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3656378993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3656378923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828189496 + 1828189497.

It is an arithmetic number, because the mean of its divisors is an integer number (1828189497).

Almost surely, 2^3656378993 is an apocalyptic number.

It is an amenable number.

3656378993 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656378993 is an equidigital number, since it uses as much as digits as its factorization.

3656378993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22044960, while the sum is 59.

The square root of 3656378993 is about 60467.9997436661. Note that the first 3 decimals coincide. The cubic root of 3656378993 is about 1540.5781537805.

The spelling of 3656378993 in words is "three billion, six hundred fifty-six million, three hundred seventy-eight thousand, nine hundred ninety-three".