645791246240 has 192 divisors, whose sum is σ = 1836876061440. Its totient is φ = 209592852480.

The previous prime is 645791246231. The next prime is 645791246249. The reversal of 645791246240 is 42642197546.

It is an interprime number because it is at equal distance from previous prime (645791246231) and next prime (645791246249).

It is not an unprimeable number, because it can be changed into a prime (645791246249) 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 31 ways as a sum of consecutive naturals, for example, 28099394 + ... + 28122366.

It is an arithmetic number, because the mean of its divisors is an integer number (9567062820).

Almost surely, 2^645791246240 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 645791246240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (918438030720).

645791246240 is an abundant number, since it is smaller than the sum of its proper divisors (1191084815200).

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

645791246240 is a wasteful number, since it uses less digits than its factorization.

645791246240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24335 (or 24327 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 645791246240 in words is "six hundred forty-five billion, seven hundred ninety-one million, two hundred forty-six thousand, two hundred forty".