18737128541 has 2 divisors, whose sum is σ = 18737128542. Its totient is φ = 18737128540.

The previous prime is 18737128513. The next prime is 18737128573. The reversal of 18737128541 is 14582173781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14093251225 + 4643877316 = 118715^2 + 68146^2 .

It is a cyclic number.

It is not a de Polignac number, because 18737128541 - 2¹⁰ = 18737127517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18737128511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368564270 + 9368564271.

It is an arithmetic number, because the mean of its divisors is an integer number (9368564271).

Almost surely, 2^18737128541 is an apocalyptic number.

It is an amenable number.

18737128541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18737128541 is an equidigital number, since it uses as much as digits as its factorization.

18737128541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 376320, while the sum is 47.

The spelling of 18737128541 in words is "eighteen billion, seven hundred thirty-seven million, one hundred twenty-eight thousand, five hundred forty-one".