20196072544477 has 2 divisors, whose sum is σ = 20196072544478. Its totient is φ = 20196072544476.

The previous prime is 20196072544451. The next prime is 20196072544481. The reversal of 20196072544477 is 77444527069102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20176500814276 + 19571730201 = 4491826^2 + 139899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20196072544477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20196072544447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10098036272238 + 10098036272239.

It is an arithmetic number, because the mean of its divisors is an integer number (10098036272239).

Almost surely, 2^{20196072544477} is an apocalyptic number.

It is an amenable number.

20196072544477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20196072544477 is an equidigital number, since it uses as much as digits as its factorization.

20196072544477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23708160, while the sum is 58.

The spelling of 20196072544477 in words is "twenty trillion, one hundred ninety-six billion, seventy-two million, five hundred forty-four thousand, four hundred seventy-seven".