645334433546 has 12 divisors (see below), whose sum is σ = 1064001814386. Its totient is φ = 293333833320.

The previous prime is 645334433519. The next prime is 645334433551.

645334433546 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 533885955625 + 111448477921 = 730675^2 + 333839^2 .

It is a super-2 number, since 2×645334433546² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645334433494 and 645334433503.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1333335365 + ... + 1333335848.

Almost surely, 2^645334433546 is an apocalyptic number.

645334433546 is a deficient number, since it is larger than the sum of its proper divisors (418667380840).

645334433546 is a wasteful number, since it uses less digits than its factorization.

645334433546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666671237 (or 2666671226 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 50.

The spelling of 645334433546 in words is "six hundred forty-five billion, three hundred thirty-four million, four hundred thirty-three thousand, five hundred forty-six".