18480220817 has 2 divisors, whose sum is σ = 18480220818. Its totient is φ = 18480220816.

The previous prime is 18480220763. The next prime is 18480220879. The reversal of 18480220817 is 71802208481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13450432576 + 5029788241 = 115976^2 + 70921^2 .

It is a cyclic number.

It is not a de Polignac number, because 18480220817 - 2²⁰ = 18479172241 is a prime.

It is a super-2 number, since 2×18480220817² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18480220117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9240110408 + 9240110409.

It is an arithmetic number, because the mean of its divisors is an integer number (9240110409).

Almost surely, 2^18480220817 is an apocalyptic number.

It is an amenable number.

18480220817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18480220817 is an equidigital number, since it uses as much as digits as its factorization.

18480220817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57344, while the sum is 41.

The spelling of 18480220817 in words is "eighteen billion, four hundred eighty million, two hundred twenty thousand, eight hundred seventeen".