645873202378546 has 16 divisors (see below), whose sum is σ = 1000235869037568. Its totient is φ = 312464873872800.

The previous prime is 645873202378507. The next prime is 645873202378549.

645873202378546 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (645873202378549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 906601075 + ... + 907313206.

It is an arithmetic number, because the mean of its divisors is an integer number (62514741814848).

Almost surely, 2^{645873202378546} is an apocalyptic number.

645873202378546 is a deficient number, since it is larger than the sum of its proper divisors (354362666659022).

645873202378546 is a wasteful number, since it uses less digits than its factorization.

645873202378546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813920057.

The product of its (nonzero) digits is 1625702400, while the sum is 70.

The spelling of 645873202378546 in words is "six hundred forty-five trillion, eight hundred seventy-three billion, two hundred two million, three hundred seventy-eight thousand, five hundred forty-six".