645611422212 has 96 divisors (see below), whose sum is σ = 1680850183040. Its totient is φ = 214299250560.

The previous prime is 645611422207. The next prime is 645611422277. The reversal of 645611422212 is 212224116546.

645611422212 is a `hidden beast` number, since 6 + 4 + 5 + 6 + 11 + 422 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59437662 + ... + 59448522.

Almost surely, 2^645611422212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645611422212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840425091520).

645611422212 is an abundant number, since it is smaller than the sum of its proper divisors (1035238760828).

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

645611422212 is a wasteful number, since it uses less digits than its factorization.

645611422212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13138 (or 13130 counting only the distinct ones).

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

Adding to 645611422212 its reverse (212224116546), we get a palindrome (857835538758).

The spelling of 645611422212 in words is "six hundred forty-five billion, six hundred eleven million, four hundred twenty-two thousand, two hundred twelve".