18701803537 has 2 divisors, whose sum is σ = 18701803538. Its totient is φ = 18701803536.

The previous prime is 18701803507. The next prime is 18701803543. The reversal of 18701803537 is 73530810781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12429797121 + 6272006416 = 111489^2 + 79196^2 .

It is an emirp because it is prime and its reverse (73530810781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18701803537 - 2¹⁹ = 18701279249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18701803493 and 18701803502.

It is not a weakly prime, because it can be changed into another prime (18701803507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350901768 + 9350901769.

It is an arithmetic number, because the mean of its divisors is an integer number (9350901769).

Almost surely, 2^18701803537 is an apocalyptic number.

It is an amenable number.

18701803537 is a deficient number, since it is larger than the sum of its proper divisors (1).

18701803537 is an equidigital number, since it uses as much as digits as its factorization.

18701803537 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 43.

The spelling of 18701803537 in words is "eighteen billion, seven hundred one million, eight hundred three thousand, five hundred thirty-seven".