645033028161 has 16 divisors (see below), whose sum is σ = 872777816064. Its totient is φ = 423683365584.

The previous prime is 645033028111. The next prime is 645033028163. The reversal of 645033028161 is 161820330546.

It is a de Polignac number, because none of the positive numbers 2^k-645033028161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645033028163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3437901 + ... + 3620666.

It is an arithmetic number, because the mean of its divisors is an integer number (54548613504).

Almost surely, 2^645033028161 is an apocalyptic number.

It is an amenable number.

645033028161 is a deficient number, since it is larger than the sum of its proper divisors (227744787903).

645033028161 is a wasteful number, since it uses less digits than its factorization.

645033028161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7059020.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 645033028161 in words is "six hundred forty-five billion, thirty-three million, twenty-eight thousand, one hundred sixty-one".