18375457409 has 2 divisors, whose sum is σ = 18375457410. Its totient is φ = 18375457408.

The previous prime is 18375457361. The next prime is 18375457469. The reversal of 18375457409 is 90475457381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15558820225 + 2816637184 = 124735^2 + 53072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18375457409 is a prime.

It is not a weakly prime, because it can be changed into another prime (18375457469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9187728704 + 9187728705.

It is an arithmetic number, because the mean of its divisors is an integer number (9187728705).

Almost surely, 2^18375457409 is an apocalyptic number.

It is an amenable number.

18375457409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18375457409 is an equidigital number, since it uses as much as digits as its factorization.

18375457409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 18375457409 in words is "eighteen billion, three hundred seventy-five million, four hundred fifty-seven thousand, four hundred nine".