18820170657 has 24 divisors (see below), whose sum is σ = 27949672296. Its totient is φ = 12194447616.

The previous prime is 18820170653. The next prime is 18820170659. The reversal of 18820170657 is 75607102881.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 720801 + 18819449856 = 849^2 + 137184^2 .

It is not a de Polignac number, because 18820170657 - 2² = 18820170653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18820170653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281863 + ... + 342179.

It is an arithmetic number, because the mean of its divisors is an integer number (1164569679).

Almost surely, 2^18820170657 is an apocalyptic number.

It is an amenable number.

18820170657 is a deficient number, since it is larger than the sum of its proper divisors (9129501639).

18820170657 is a wasteful number, since it uses less digits than its factorization.

18820170657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61297 (or 61294 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 18820170657 in words is "eighteen billion, eight hundred twenty million, one hundred seventy thousand, six hundred fifty-seven".