645259952546 has 32 divisors (see below), whose sum is σ = 1111609638720. Its totient is φ = 277823865600.

The previous prime is 645259952537. The next prime is 645259952551.

645259952546 is nontrivially palindromic in base 10.

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 15 ways as a sum of consecutive naturals, for example, 2954750 + ... + 3165606.

It is an arithmetic number, because the mean of its divisors is an integer number (34737801210).

Almost surely, 2^645259952546 is an apocalyptic number.

645259952546 is a deficient number, since it is larger than the sum of its proper divisors (466349686174).

645259952546 is a wasteful number, since it uses less digits than its factorization.

645259952546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218210.

The product of its digits is 116640000, while the sum is 62.

The spelling of 645259952546 in words is "six hundred forty-five billion, two hundred fifty-nine million, nine hundred fifty-two thousand, five hundred forty-six".