18745670609 has 2 divisors, whose sum is σ = 18745670610. Its totient is φ = 18745670608.

The previous prime is 18745670597. The next prime is 18745670623. The reversal of 18745670609 is 90607654781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17358853009 + 1386817600 = 131753^2 + 37240^2 .

It is a cyclic number.

It is not a de Polignac number, because 18745670609 - 2⁸ = 18745670353 is a prime.

It is a super-2 number, since 2×18745670609² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18745670809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372835304 + 9372835305.

It is an arithmetic number, because the mean of its divisors is an integer number (9372835305).

Almost surely, 2^18745670609 is an apocalyptic number.

It is an amenable number.

18745670609 is a deficient number, since it is larger than the sum of its proper divisors (1).

18745670609 is an equidigital number, since it uses as much as digits as its factorization.

18745670609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 18745670609 in words is "eighteen billion, seven hundred forty-five million, six hundred seventy thousand, six hundred nine".