816645363200 has 60 divisors (see below), whose sum is σ = 2023302719460. Its totient is φ = 326658140160.

The previous prime is 816645363179. The next prime is 816645363223. The reversal of 816645363200 is 2363546618.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31887410 + ... + 31913009.

It is an arithmetic number, because the mean of its divisors is an integer number (33721711991).

Almost surely, 2^816645363200 is an apocalyptic number.

816645363200 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

816645363200 is an abundant number, since it is smaller than the sum of its proper divisors (1206657356260).

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

816645363200 is an equidigital number, since it uses as much as digits as its factorization.

816645363200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63800447 (or 63800426 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 816645363200 in words is "eight hundred sixteen billion, six hundred forty-five million, three hundred sixty-three thousand, two hundred".