475991809413121 has 2 divisors, whose sum is σ = 475991809413122. Its totient is φ = 475991809413120.

The previous prime is 475991809413053. The next prime is 475991809413181. The reversal of 475991809413121 is 121314908199574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468980646833521 + 7011162579600 = 21655961^2 + 2647860^2 .

It is a cyclic number.

It is not a de Polignac number, because 475991809413121 - 2¹⁷ = 475991809282049 is a prime.

It is not a weakly prime, because it can be changed into another prime (475991809413181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237995904706560 + 237995904706561.

It is an arithmetic number, because the mean of its divisors is an integer number (237995904706561).

Almost surely, 2^{475991809413121} is an apocalyptic number.

It is an amenable number.

475991809413121 is a deficient number, since it is larger than the sum of its proper divisors (1).

475991809413121 is an equidigital number, since it uses as much as digits as its factorization.

475991809413121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 475991809413121 in words is "four hundred seventy-five trillion, nine hundred ninety-one billion, eight hundred nine million, four hundred thirteen thousand, one hundred twenty-one".