18520035529 has 2 divisors, whose sum is σ = 18520035530. Its totient is φ = 18520035528.

The previous prime is 18520035481. The next prime is 18520035553. The reversal of 18520035529 is 92553002581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16362247225 + 2157788304 = 127915^2 + 46452^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520035529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18520035491 and 18520035500.

It is not a weakly prime, because it can be changed into another prime (18520036529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260017764 + 9260017765.

It is an arithmetic number, because the mean of its divisors is an integer number (9260017765).

Almost surely, 2^18520035529 is an apocalyptic number.

It is an amenable number.

18520035529 is a deficient number, since it is larger than the sum of its proper divisors (1).

18520035529 is an equidigital number, since it uses as much as digits as its factorization.

18520035529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 18520035529 in words is "eighteen billion, five hundred twenty million, thirty-five thousand, five hundred twenty-nine".