18500000137 has 2 divisors, whose sum is σ = 18500000138. Its totient is φ = 18500000136.

The previous prime is 18500000119. The next prime is 18500000153. The reversal of 18500000137 is 73100000581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18498992121 + 1008016 = 136011^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 18500000137 - 2¹⁹ = 18499475849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18500090137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9250000068 + 9250000069.

It is an arithmetic number, because the mean of its divisors is an integer number (9250000069).

Almost surely, 2^18500000137 is an apocalyptic number.

It is an amenable number.

18500000137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18500000137 is an equidigital number, since it uses as much as digits as its factorization.

18500000137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 25.

The spelling of 18500000137 in words is "eighteen billion, five hundred million, one hundred thirty-seven", and thus it is an aban number.