645542620603 has 8 divisors (see below), whose sum is σ = 673658690976. Its totient is φ = 617430633600.

The previous prime is 645542620589. The next prime is 645542620607. The reversal of 645542620603 is 306026245546.

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

It is a cyclic number.

It is not a de Polignac number, because 645542620603 - 2⁹ = 645542620091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645542620603.

It is not an unprimeable number, because it can be changed into a prime (645542620607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695568 + ... + 1332253.

It is an arithmetic number, because the mean of its divisors is an integer number (84207336372).

Almost surely, 2^645542620603 is an apocalyptic number.

645542620603 is a deficient number, since it is larger than the sum of its proper divisors (28116070373).

645542620603 is a wasteful number, since it uses less digits than its factorization.

645542620603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041685.

The product of its (nonzero) digits is 1036800, while the sum is 43.

The spelling of 645542620603 in words is "six hundred forty-five billion, five hundred forty-two million, six hundred twenty thousand, six hundred three".