645630454722 has 96 divisors (see below), whose sum is σ = 1466591519232. Its totient is φ = 189142272000.

The previous prime is 645630454699. The next prime is 645630454723. The reversal of 645630454722 is 227454036546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645630454723) 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 47 ways as a sum of consecutive naturals, for example, 22964578 + ... + 22992674.

It is an arithmetic number, because the mean of its divisors is an integer number (15276994992).

Almost surely, 2^645630454722 is an apocalyptic number.

645630454722 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 645630454722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733295759616).

645630454722 is an abundant number, since it is smaller than the sum of its proper divisors (820961064510).

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

645630454722 is a wasteful number, since it uses less digits than its factorization.

645630454722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29176 (or 29165 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 48.

The spelling of 645630454722 in words is "six hundred forty-five billion, six hundred thirty million, four hundred fifty-four thousand, seven hundred twenty-two".