18920753213 has 2 divisors, whose sum is σ = 18920753214. Its totient is φ = 18920753212.

The previous prime is 18920753191. The next prime is 18920753297. The reversal of 18920753213 is 31235702981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17713746649 + 1207006564 = 133093^2 + 34742^2 .

It is a cyclic number.

It is not a de Polignac number, because 18920753213 - 2⁶ = 18920753149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18920753113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460376606 + 9460376607.

It is an arithmetic number, because the mean of its divisors is an integer number (9460376607).

Almost surely, 2^18920753213 is an apocalyptic number.

It is an amenable number.

18920753213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18920753213 is an equidigital number, since it uses as much as digits as its factorization.

18920753213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 18920753213 in words is "eighteen billion, nine hundred twenty million, seven hundred fifty-three thousand, two hundred thirteen".