645889929988546 has 8 divisors (see below), whose sum is σ = 974435096688444. Its totient is φ = 321078231092400.

The previous prime is 645889929988507. The next prime is 645889929988561.

645889929988546 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 636021919275625 + 9868010712921 = 25219475^2 + 3141339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933366950505 + ... + 933366951196.

Almost surely, 2^{645889929988546} is an apocalyptic number.

645889929988546 is a deficient number, since it is larger than the sum of its proper divisors (328545166699898).

645889929988546 is a wasteful number, since it uses less digits than its factorization.

645889929988546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866733901876.

The product of its digits is 773967052800, while the sum is 100.

The spelling of 645889929988546 in words is "six hundred forty-five trillion, eight hundred eighty-nine billion, nine hundred twenty-nine million, nine hundred eighty-eight thousand, five hundred forty-six".