97918816820 has 54 divisors (see below), whose sum is σ = 226058063238. Its totient is φ = 35601244800.

The previous prime is 97918816819. The next prime is 97918816829. The reversal of 97918816820 is 2861881979.

It can be written as a sum of positive squares in 3 ways, for example, as 311310736 + 97607506084 = 17644^2 + 312422^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 97918816820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97918816829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15390440 + ... + 15396800.

Almost surely, 2^97918816820 is an apocalyptic number.

It is an amenable number.

97918816820 is an abundant number, since it is smaller than the sum of its proper divisors (128139246418).

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

97918816820 is an equidigital number, since it uses as much as digits as its factorization.

97918816820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12753 (or 6379 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 59.

The spelling of 97918816820 in words is "ninety-seven billion, nine hundred eighteen million, eight hundred sixteen thousand, eight hundred twenty".