18872200385 has 4 divisors (see below), whose sum is σ = 22646640468. Its totient is φ = 15097760304.

The previous prime is 18872200349. The next prime is 18872200397. The reversal of 18872200385 is 58300227881.

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 2828431489 + 16043768896 = 53183^2 + 126664^2 .

It is a cyclic number.

It is not a de Polignac number, because 18872200385 - 2²² = 18868006081 is a prime.

It is a super-3 number, since 3×18872200385³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887220034 + ... + 1887220043.

It is an arithmetic number, because the mean of its divisors is an integer number (5661660117).

Almost surely, 2^18872200385 is an apocalyptic number.

It is an amenable number.

18872200385 is a deficient number, since it is larger than the sum of its proper divisors (3774440083).

18872200385 is an equidigital number, since it uses as much as digits as its factorization.

18872200385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3774440082.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 18872200385 in words is "eighteen billion, eight hundred seventy-two million, two hundred thousand, three hundred eighty-five".