18321878827 has 8 divisors (see below), whose sum is σ = 20961549792. Its totient is φ = 15687772800.

The previous prime is 18321878777. The next prime is 18321878837. The reversal of 18321878827 is 72887812381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18321878827 - 2⁷ = 18321878699 is a prime.

It is a super-4 number, since 4×18321878827⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18321878837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1384174 + ... + 1397347.

It is an arithmetic number, because the mean of its divisors is an integer number (2620193724).

Almost surely, 2^18321878827 is an apocalyptic number.

18321878827 is a deficient number, since it is larger than the sum of its proper divisors (2639670965).

18321878827 is an equidigital number, since it uses as much as digits as its factorization.

18321878827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782469.

The product of its digits is 2408448, while the sum is 55.

The spelling of 18321878827 in words is "eighteen billion, three hundred twenty-one million, eight hundred seventy-eight thousand, eight hundred twenty-seven".