645350794729 has 16 divisors (see below), whose sum is σ = 653578300800. Its totient is φ = 637161033600.

The previous prime is 645350794703. The next prime is 645350794733. The reversal of 645350794729 is 927497053546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 645350794729 - 2⁷ = 645350794601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645350794799) 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, 118431997 + ... + 118437445.

It is an arithmetic number, because the mean of its divisors is an integer number (40848643800).

Almost surely, 2^645350794729 is an apocalyptic number.

It is an amenable number.

645350794729 is a deficient number, since it is larger than the sum of its proper divisors (8227506071).

645350794729 is a wasteful number, since it uses less digits than its factorization.

645350794729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8640.

The product of its (nonzero) digits is 57153600, while the sum is 61.

The spelling of 645350794729 in words is "six hundred forty-five billion, three hundred fifty million, seven hundred ninety-four thousand, seven hundred twenty-nine".