645611304260 has 96 divisors (see below), whose sum is σ = 1463362528992. Its totient is φ = 237843578880.

The previous prime is 645611304241. The next prime is 645611304281. The reversal of 645611304260 is 62403116546.

It can be written as a sum of positive squares in 16 ways, for example, as 297339002944 + 348272301316 = 545288^2 + 590146^2 .

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 370826990 + ... + 370828730.

It is an arithmetic number, because the mean of its divisors is an integer number (15243359677).

Almost surely, 2^645611304260 is an apocalyptic number.

It is an amenable number.

645611304260 is an abundant number, since it is smaller than the sum of its proper divisors (817751224732).

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

645611304260 is a wasteful number, since it uses less digits than its factorization.

645611304260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153 (or 4151 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 645611304260 in words is "six hundred forty-five billion, six hundred eleven million, three hundred four thousand, two hundred sixty".