18993065401 has 2 divisors, whose sum is σ = 18993065402. Its totient is φ = 18993065400.

The previous prime is 18993065387. The next prime is 18993065407. The reversal of 18993065401 is 10456039981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18933760000 + 59305401 = 137600^2 + 7701^2 .

It is an emirp because it is prime and its reverse (10456039981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18993065401 - 2¹⁷ = 18992934329 is a prime.

It is not a weakly prime, because it can be changed into another prime (18993065407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9496532700 + 9496532701.

It is an arithmetic number, because the mean of its divisors is an integer number (9496532701).

Almost surely, 2^18993065401 is an apocalyptic number.

It is an amenable number.

18993065401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18993065401 is an equidigital number, since it uses as much as digits as its factorization.

18993065401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 18993065401 in words is "eighteen billion, nine hundred ninety-three million, sixty-five thousand, four hundred one".