18953202409 has 2 divisors, whose sum is σ = 18953202410. Its totient is φ = 18953202408.

The previous prime is 18953202379. The next prime is 18953202413. The reversal of 18953202409 is 90420235981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18538184025 + 415018384 = 136155^2 + 20372^2 .

It is an emirp because it is prime and its reverse (90420235981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18953202409 - 2¹³ = 18953194217 is a prime.

It is not a weakly prime, because it can be changed into another prime (18953212409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9476601204 + 9476601205.

It is an arithmetic number, because the mean of its divisors is an integer number (9476601205).

Almost surely, 2^18953202409 is an apocalyptic number.

It is an amenable number.

18953202409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18953202409 is an equidigital number, since it uses as much as digits as its factorization.

18953202409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 18953202409 in words is "eighteen billion, nine hundred fifty-three million, two hundred two thousand, four hundred nine".