18501683149 has 2 divisors, whose sum is σ = 18501683150. Its totient is φ = 18501683148.

The previous prime is 18501683131. The next prime is 18501683171. The reversal of 18501683149 is 94138610581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18193153924 + 308529225 = 134882^2 + 17565^2 .

It is a cyclic number.

It is not a de Polignac number, because 18501683149 - 2¹⁷ = 18501552077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18501683099 and 18501683108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18501683119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9250841574 + 9250841575.

It is an arithmetic number, because the mean of its divisors is an integer number (9250841575).

Almost surely, 2^18501683149 is an apocalyptic number.

It is an amenable number.

18501683149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18501683149 is an equidigital number, since it uses as much as digits as its factorization.

18501683149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 18501683149 in words is "eighteen billion, five hundred one million, six hundred eighty-three thousand, one hundred forty-nine".