645233053697 has 16 divisors (see below), whose sum is σ = 664231415952. Its totient is φ = 626318542080.

The previous prime is 645233053693. The next prime is 645233053709. The reversal of 645233053697 is 796350332546.

It is a Cunningham number, because it is equal to 803264²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 67870149361 + 577362904336 = 260519^2 + 759844^2 .

It is a cyclic number.

It is not a de Polignac number, because 645233053697 - 2² = 645233053693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645233053693) 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, 28361747 + ... + 28384487.

It is an arithmetic number, because the mean of its divisors is an integer number (41514463497).

Almost surely, 2^645233053697 is an apocalyptic number.

It is an amenable number.

645233053697 is a deficient number, since it is larger than the sum of its proper divisors (18998362255).

645233053697 is a wasteful number, since it uses less digits than its factorization.

645233053697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24548.

The product of its (nonzero) digits is 12247200, while the sum is 53.

The spelling of 645233053697 in words is "six hundred forty-five billion, two hundred thirty-three million, fifty-three thousand, six hundred ninety-seven".