645078273205484 has 12 divisors (see below), whose sum is σ = 1167814115286000. Its totient is φ = 311417097409488.

The previous prime is 645078273205459. The next prime is 645078273205507. The reversal of 645078273205484 is 484502372870546.

It is a super-2 number, since 2×645078273205484² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645078273205484.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2780509798184 + ... + 2780509798415.

It is an arithmetic number, because the mean of its divisors is an integer number (97317842940500).

Almost surely, 2^{645078273205484} is an apocalyptic number.

It is an amenable number.

645078273205484 is a deficient number, since it is larger than the sum of its proper divisors (522735842080516).

645078273205484 is a wasteful number, since it uses less digits than its factorization.

645078273205484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561019596632 (or 5561019596630 counting only the distinct ones).

The product of its (nonzero) digits is 361267200, while the sum is 65.

The spelling of 645078273205484 in words is "six hundred forty-five trillion, seventy-eight billion, two hundred seventy-three million, two hundred five thousand, four hundred eighty-four".