18520035481 has 2 divisors, whose sum is σ = 18520035482. Its totient is φ = 18520035480.

The previous prime is 18520035461. The next prime is 18520035529. The reversal of 18520035481 is 18453002581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9905225625 + 8614809856 = 99525^2 + 92816^2 .

It is a cyclic number.

It is not a de Polignac number, because 18520035481 - 2⁵ = 18520035449 is a prime.

It is a super-2 number, since 2×18520035481² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18520035481.

It is not a weakly prime, because it can be changed into another prime (18520035461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260017740 + 9260017741.

It is an arithmetic number, because the mean of its divisors is an integer number (9260017741).

Almost surely, 2^18520035481 is an apocalyptic number.

It is an amenable number.

18520035481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18520035481 is an equidigital number, since it uses as much as digits as its factorization.

18520035481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 18520035481 in words is "eighteen billion, five hundred twenty million, thirty-five thousand, four hundred eighty-one".