645064611340 has 24 divisors (see below), whose sum is σ = 1374854129712. Its totient is φ = 254174712000.

The previous prime is 645064611299. The next prime is 645064611341. The reversal of 645064611340 is 43116460546.

It is a happy number.

It is a super-2 number, since 2×645064611340² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645064611293 and 645064611302.

It is not an unprimeable number, because it can be changed into a prime (645064611341) 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 7 ways as a sum of consecutive naturals, for example, 240694411 + ... + 240697090.

It is an arithmetic number, because the mean of its divisors is an integer number (57285588738).

Almost surely, 2^645064611340 is an apocalyptic number.

It is an amenable number.

645064611340 is an abundant number, since it is smaller than the sum of its proper divisors (729789518372).

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

645064611340 is a wasteful number, since it uses less digits than its factorization.

645064611340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481391577 (or 481391575 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 645064611340 in words is "six hundred forty-five billion, sixty-four million, six hundred eleven thousand, three hundred forty".