3640538043409 has 2 divisors, whose sum is σ = 3640538043410. Its totient is φ = 3640538043408.

The previous prime is 3640538043323. The next prime is 3640538043413. The reversal of 3640538043409 is 9043408350463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2293770830400 + 1346767213009 = 1514520^2 + 1160503^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640538043409 - 2⁷ = 3640538043281 is a prime.

It is not a weakly prime, because it can be changed into another prime (3640538043479) 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, 1820269021704 + 1820269021705.

It is an arithmetic number, because the mean of its divisors is an integer number (1820269021705).

Almost surely, 2^{3640538043409} is an apocalyptic number.

It is an amenable number.

3640538043409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640538043409 is an equidigital number, since it uses as much as digits as its factorization.

3640538043409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 3640538043409 in words is "three trillion, six hundred forty billion, five hundred thirty-eight million, forty-three thousand, four hundred nine".