212640066530 has 32 divisors (see below), whose sum is σ = 389106100080. Its totient is φ = 83644600320.

The previous prime is 212640066481. The next prime is 212640066539. The reversal of 212640066530 is 35660046212.

It is a happy number.

212640066530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 123551547001 + 89088519529 = 351499^2 + 298477^2 .

It is not an unprimeable number, because it can be changed into a prime (212640066539) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3198266 + ... + 3264074.

Almost surely, 2^212640066530 is an apocalyptic number.

212640066530 is a deficient number, since it is larger than the sum of its proper divisors (176466033550).

212640066530 is a wasteful number, since it uses less digits than its factorization.

212640066530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71174.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 212640066530 in words is "two hundred twelve billion, six hundred forty million, sixty-six thousand, five hundred thirty".