18507544541 has 2 divisors, whose sum is σ = 18507544542. Its totient is φ = 18507544540.

The previous prime is 18507544537. The next prime is 18507544553. The reversal of 18507544541 is 14544570581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18345618916 + 161925625 = 135446^2 + 12725^2 .

It is a cyclic number.

It is not a de Polignac number, because 18507544541 - 2² = 18507544537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18507544492 and 18507544501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18507544841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9253772270 + 9253772271.

It is an arithmetic number, because the mean of its divisors is an integer number (9253772271).

Almost surely, 2^18507544541 is an apocalyptic number.

It is an amenable number.

18507544541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18507544541 is an equidigital number, since it uses as much as digits as its factorization.

18507544541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448000, while the sum is 44.

The spelling of 18507544541 in words is "eighteen billion, five hundred seven million, five hundred forty-four thousand, five hundred forty-one".