18353520017 has 6 divisors (see below), whose sum is σ = 21350013138. Its totient is φ = 15731588544.

The previous prime is 18353520007. The next prime is 18353520037. The reversal of 18353520017 is 71002535381.

It can be written as a sum of positive squares in only one way, i.e., 11586154321 + 6767365696 = 107639^2 + 82264^2 .

It is not a de Polignac number, because 18353520017 - 2¹⁰ = 18353518993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18353520007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 187280768 + ... + 187280865.

It is an arithmetic number, because the mean of its divisors is an integer number (3558335523).

Almost surely, 2^18353520017 is an apocalyptic number.

It is an amenable number.

18353520017 is a deficient number, since it is larger than the sum of its proper divisors (2996493121).

18353520017 is an equidigital number, since it uses as much as digits as its factorization.

18353520017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374561647 (or 374561640 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 18353520017 in words is "eighteen billion, three hundred fifty-three million, five hundred twenty thousand, seventeen".