645101042564 has 24 divisors (see below), whose sum is σ = 1244253003168. Its totient is φ = 290204778240.

The previous prime is 645101042557. The next prime is 645101042603. The reversal of 645101042564 is 465240101546.

It is a happy number.

It is an unprimeable number.

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, 75569894 + ... + 75578429.

It is an arithmetic number, because the mean of its divisors is an integer number (51843875132).

Almost surely, 2^645101042564 is an apocalyptic number.

It is an amenable number.

645101042564 is a deficient number, since it is larger than the sum of its proper divisors (599151960604).

645101042564 is a wasteful number, since it uses less digits than its factorization.

645101042564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151148435 (or 151148433 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 645101042564 in words is "six hundred forty-five billion, one hundred one million, forty-two thousand, five hundred sixty-four".