645233113212 has 12 divisors (see below), whose sum is σ = 1505543930856. Its totient is φ = 215077704400.

The previous prime is 645233113211. The next prime is 645233113219. The reversal of 645233113212 is 212311332546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×645233113212³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645233113211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26884713039 + ... + 26884713062.

It is an arithmetic number, because the mean of its divisors is an integer number (125461994238).

Almost surely, 2^645233113212 is an apocalyptic number.

It is an amenable number.

645233113212 is an abundant number, since it is smaller than the sum of its proper divisors (860310817644).

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

645233113212 is a wasteful number, since it uses less digits than its factorization.

645233113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53769426108 (or 53769426106 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

Adding to 645233113212 its reverse (212311332546), we get a palindrome (857544445758).

The spelling of 645233113212 in words is "six hundred forty-five billion, two hundred thirty-three million, one hundred thirteen thousand, two hundred twelve".