645533603355 has 16 divisors (see below), whose sum is σ = 1032930165024. Its totient is φ = 344259121920.

The previous prime is 645533603327. The next prime is 645533603399. The reversal of 645533603355 is 553306335546.

It is not a de Polignac number, because 645533603355 - 2¹⁶ = 645533537819 is a prime.

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, 1381216 + ... + 1788525.

It is an arithmetic number, because the mean of its divisors is an integer number (64558135314).

Almost surely, 2^645533603355 is an apocalyptic number.

645533603355 is a deficient number, since it is larger than the sum of its proper divisors (387396561669).

645533603355 is a wasteful number, since it uses less digits than its factorization.

645533603355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3183326.

The product of its (nonzero) digits is 7290000, while the sum is 48.

The spelling of 645533603355 in words is "six hundred forty-five billion, five hundred thirty-three million, six hundred three thousand, three hundred fifty-five".