18521685017 has 12 divisors (see below), whose sum is σ = 20379387840. Its totient is φ = 16820658360.

The previous prime is 18521685001. The next prime is 18521685031. The reversal of 18521685017 is 71058612581.

It is not a de Polignac number, because 18521685017 - 2⁴ = 18521685001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18521685517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41084 + ... + 196802.

It is an arithmetic number, because the mean of its divisors is an integer number (1698282320).

Almost surely, 2^18521685017 is an apocalyptic number.

It is an amenable number.

18521685017 is a deficient number, since it is larger than the sum of its proper divisors (1857702823).

18521685017 is a wasteful number, since it uses less digits than its factorization.

18521685017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156724 (or 156713 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 44.

The spelling of 18521685017 in words is "eighteen billion, five hundred twenty-one million, six hundred eighty-five thousand, seventeen".