18885170357 has 4 divisors (see below), whose sum is σ = 19241494380. Its totient is φ = 18528846336.

The previous prime is 18885170329. The next prime is 18885170363. The reversal of 18885170357 is 75307158881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75307158881 = 155741 ⋅483541.

It can be written as a sum of positive squares in 2 ways, for example, as 10325404996 + 8559765361 = 101614^2 + 92519^2 .

It is a cyclic number.

It is not a de Polignac number, because 18885170357 - 2²² = 18880976053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 356323969 = 18885170357 / (1 + 8 + 8 + 8 + 5 + 1 + 7 + 0 + 3 + 5 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18885170299 and 18885170308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18885173357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178161932 + ... + 178162037.

It is an arithmetic number, because the mean of its divisors is an integer number (4810373595).

Almost surely, 2^18885170357 is an apocalyptic number.

It is an amenable number.

18885170357 is a deficient number, since it is larger than the sum of its proper divisors (356324023).

18885170357 is an equidigital number, since it uses as much as digits as its factorization.

18885170357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356324022.

The product of its (nonzero) digits is 1881600, while the sum is 53.

The spelling of 18885170357 in words is "eighteen billion, eight hundred eighty-five million, one hundred seventy thousand, three hundred fifty-seven".