321618288996 has 81 divisors (see below), whose sum is σ = 840326290713. Its totient is φ = 103713808320.

The previous prime is 321618288857. The next prime is 321618288997. The reversal of 321618288996 is 699882816123.

The square root of 321618288996 is 567114.

It is a perfect power (a square), and thus also a powerful number.

321618288996 is a `hidden beast` number, since 3 + 2 + 1 + 618 + 2 + 8 + 8 + 9 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 34665226596 + 286953062400 = 186186^2 + 535680^2 .

It is not an unprimeable number, because it can be changed into a prime (321618288997) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 105481680 + ... + 105484728.

Almost surely, 2^321618288996 is an apocalyptic number.

321618288996 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

321618288996 is the 567114-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321618288996

321618288996 is an abundant number, since it is smaller than the sum of its proper divisors (518708001717).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321618288996 is an equidigital number, since it uses as much as digits as its factorization.

321618288996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6170 (or 3085 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 63.

The spelling of 321618288996 in words is "three hundred twenty-one billion, six hundred eighteen million, two hundred eighty-eight thousand, nine hundred ninety-six".