20209046458177 has 2 divisors, whose sum is σ = 20209046458178. Its totient is φ = 20209046458176.

The previous prime is 20209046458157. The next prime is 20209046458199. The reversal of 20209046458177 is 77185464090202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18631688805136 + 1577357653041 = 4316444^2 + 1255929^2 .

It is a cyclic number.

It is not a de Polignac number, because 20209046458177 - 2¹⁹ = 20209045933889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20209046458157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104523229088 + 10104523229089.

It is an arithmetic number, because the mean of its divisors is an integer number (10104523229089).

Almost surely, 2^{20209046458177} is an apocalyptic number.

It is an amenable number.

20209046458177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20209046458177 is an equidigital number, since it uses as much as digits as its factorization.

20209046458177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 20209046458177 in words is "twenty trillion, two hundred nine billion, forty-six million, four hundred fifty-eight thousand, one hundred seventy-seven".