43641605207257 has 2 divisors, whose sum is σ = 43641605207258. Its totient is φ = 43641605207256.

The previous prime is 43641605207227. The next prime is 43641605207303. The reversal of 43641605207257 is 75270250614634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43640504361216 + 1100846041 = 6606096^2 + 33179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43641605207257 is a prime.

It is not a weakly prime, because it can be changed into another prime (43641605207227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21820802603628 + 21820802603629.

It is an arithmetic number, because the mean of its divisors is an integer number (21820802603629).

Almost surely, 2^{43641605207257} is an apocalyptic number.

It is an amenable number.

43641605207257 is a deficient number, since it is larger than the sum of its proper divisors (1).

43641605207257 is an equidigital number, since it uses as much as digits as its factorization.

43641605207257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8467200, while the sum is 52.

The spelling of 43641605207257 in words is "forty-three trillion, six hundred forty-one billion, six hundred five million, two hundred seven thousand, two hundred fifty-seven".