218015485481 has 2 divisors, whose sum is σ = 218015485482. Its totient is φ = 218015485480.

The previous prime is 218015485459. The next prime is 218015485529. The reversal of 218015485481 is 184584510812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127531837456 + 90483648025 = 357116^2 + 300805^2 .

It is a cyclic number.

It is not a de Polignac number, because 218015485481 - 2⁶ = 218015485417 is a prime.

It is a super-2 number, since 2×218015485481² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218015485081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109007742740 + 109007742741.

It is an arithmetic number, because the mean of its divisors is an integer number (109007742741).

Almost surely, 2^218015485481 is an apocalyptic number.

It is an amenable number.

218015485481 is a deficient number, since it is larger than the sum of its proper divisors (1).

218015485481 is an equidigital number, since it uses as much as digits as its factorization.

218015485481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 409600, while the sum is 47.

The spelling of 218015485481 in words is "two hundred eighteen billion, fifteen million, four hundred eighty-five thousand, four hundred eighty-one".