18817812057 has 16 divisors (see below), whose sum is σ = 28981444032. Its totient is φ = 10733867520.

The previous prime is 18817812047. The next prime is 18817812161. The reversal of 18817812057 is 75021871881.

It is not a de Polignac number, because 18817812057 - 2¹² = 18817807961 is a prime.

It is a super-2 number, since 2×18817812057² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18817811997 and 18817812015.

It is not an unprimeable number, because it can be changed into a prime (18817812037) 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 15 ways as a sum of consecutive naturals, for example, 16771108 + ... + 16772229.

It is an arithmetic number, because the mean of its divisors is an integer number (1811340252).

Almost surely, 2^18817812057 is an apocalyptic number.

18817812057 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18817812057 is a deficient number, since it is larger than the sum of its proper divisors (10163631975).

18817812057 is a wasteful number, since it uses less digits than its factorization.

18817812057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33543368.

The product of its (nonzero) digits is 250880, while the sum is 48.

The spelling of 18817812057 in words is "eighteen billion, eight hundred seventeen million, eight hundred twelve thousand, fifty-seven".