18820406851 has 18 divisors (see below), whose sum is σ = 19974715956. Its totient is φ = 17730203400.

The previous prime is 18820406827. The next prime is 18820406887. The reversal of 18820406851 is 15860402881.

It is not a de Polignac number, because 18820406851 - 2¹¹ = 18820404803 is a prime.

It is a super-3 number, since 3×18820406851³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18820406798 and 18820406807.

It is not an unprimeable number, because it can be changed into a prime (18820406821) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16071496 + ... + 16072666.

It is an arithmetic number, because the mean of its divisors is an integer number (1109706442).

Almost surely, 2^18820406851 is an apocalyptic number.

18820406851 is a deficient number, since it is larger than the sum of its proper divisors (1154309105).

18820406851 is an equidigital number, since it uses as much as digits as its factorization.

18820406851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1401 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 18820406851 in words is "eighteen billion, eight hundred twenty million, four hundred six thousand, eight hundred fifty-one".