645635203633 has 8 divisors (see below), whose sum is σ = 738122477760. Its totient is φ = 553211347920.

The previous prime is 645635203621. The next prime is 645635203639. The reversal of 645635203633 is 336302536546.

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

It is not a de Polignac number, because 645635203633 - 2⁵ = 645635203601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645635203639) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15832783 + ... + 15873508.

It is an arithmetic number, because the mean of its divisors is an integer number (92265309720).

Almost surely, 2^645635203633 is an apocalyptic number.

It is an amenable number.

645635203633 is a deficient number, since it is larger than the sum of its proper divisors (92487274127).

645635203633 is a wasteful number, since it uses less digits than its factorization.

645635203633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31709207.

The product of its (nonzero) digits is 3499200, while the sum is 46.

The spelling of 645635203633 in words is "six hundred forty-five billion, six hundred thirty-five million, two hundred three thousand, six hundred thirty-three".