18782851057 has 4 divisors (see below), whose sum is σ = 18783326196. Its totient is φ = 18782375920.

The previous prime is 18782851007. The next prime is 18782851067. The reversal of 18782851057 is 75015828781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2089952656 + 16692898401 = 45716^2 + 129201^2 .

It is a cyclic number.

It is not a de Polignac number, because 18782851057 - 2²³ = 18774462449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18782850995 and 18782851013.

It is not an unprimeable number, because it can be changed into a prime (18782851007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172294 + ... + 259327.

It is an arithmetic number, because the mean of its divisors is an integer number (4695831549).

Almost surely, 2^18782851057 is an apocalyptic number.

It is an amenable number.

18782851057 is a deficient number, since it is larger than the sum of its proper divisors (475139).

18782851057 is an equidigital number, since it uses as much as digits as its factorization.

18782851057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475138.

The product of its (nonzero) digits is 1254400, while the sum is 52.

The spelling of 18782851057 in words is "eighteen billion, seven hundred eighty-two million, eight hundred fifty-one thousand, fifty-seven".