18933061909 has 2 divisors, whose sum is σ = 18933061910. Its totient is φ = 18933061908.

The previous prime is 18933061883. The next prime is 18933061913. The reversal of 18933061909 is 90916033981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14370734884 + 4562327025 = 119878^2 + 67545^2 .

It is a cyclic number.

It is not a de Polignac number, because 18933061909 - 2⁷ = 18933061781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18933061919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9466530954 + 9466530955.

It is an arithmetic number, because the mean of its divisors is an integer number (9466530955).

Almost surely, 2^18933061909 is an apocalyptic number.

It is an amenable number.

18933061909 is a deficient number, since it is larger than the sum of its proper divisors (1).

18933061909 is an equidigital number, since it uses as much as digits as its factorization.

18933061909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 49.

The spelling of 18933061909 in words is "eighteen billion, nine hundred thirty-three million, sixty-one thousand, nine hundred nine".