645540136125260 has 24 divisors (see below), whose sum is σ = 1355808241571616. Its totient is φ = 258182920029440.

The previous prime is 645540136125259. The next prime is 645540136125323. The reversal of 645540136125260 is 62521631045546.

It is a junction number, because it is equal to n+sod(n) for n = 645540136125199 and 645540136125208.

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 7 ways as a sum of consecutive naturals, for example, 2070741536 + ... + 2071053255.

It is an arithmetic number, because the mean of its divisors is an integer number (56492010065484).

Almost surely, 2^{645540136125260} is an apocalyptic number.

It is an amenable number.

645540136125260 is an abundant number, since it is smaller than the sum of its proper divisors (710268105446356).

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

645540136125260 is a wasteful number, since it uses less digits than its factorization.

645540136125260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141802593 (or 4141802591 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 645540136125260 in words is "six hundred forty-five trillion, five hundred forty billion, one hundred thirty-six million, one hundred twenty-five thousand, two hundred sixty".