20203011999161 has 2 divisors, whose sum is σ = 20203011999162. Its totient is φ = 20203011999160.

The previous prime is 20203011999139. The next prime is 20203011999199. The reversal of 20203011999161 is 16199911030202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14024088765625 + 6178923233536 = 3744875^2 + 2485744^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203011999161 - 2¹⁸ = 20203011737017 is a prime.

It is not a weakly prime, because it can be changed into another prime (20203011999761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101505999580 + 10101505999581.

It is an arithmetic number, because the mean of its divisors is an integer number (10101505999581).

Almost surely, 2^{20203011999161} is an apocalyptic number.

It is an amenable number.

20203011999161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203011999161 is an equidigital number, since it uses as much as digits as its factorization.

20203011999161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 20203011999161 in words is "twenty trillion, two hundred three billion, eleven million, nine hundred ninety-nine thousand, one hundred sixty-one".