816220314450 has 54 divisors (see below), whose sum is σ = 2192963402799. Its totient is φ = 217653639840.

The previous prime is 816220314397. The next prime is 816220314557. The reversal of 816220314450 is 54413022618.

It is a happy number.

816220314450 is a `hidden beast` number, since 8 + 1 + 6 + 2 + 203 + 1 + 445 + 0 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 40036408281 + 776183906169 = 200091^2 + 881013^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=638835.

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 26 ways as a sum of consecutive naturals, for example, 19143756 + ... + 19186344.

Almost surely, 2^816220314450 is an apocalyptic number.

816220314450 is an abundant number, since it is smaller than the sum of its proper divisors (1376743088349).

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

816220314450 is an frugal number, since it uses more digits than its factorization.

816220314450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85196 (or 42599 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 816220314450 in words is "eight hundred sixteen billion, two hundred twenty million, three hundred fourteen thousand, four hundred fifty".