645922960418 has 18 divisors (see below), whose sum is σ = 972204953979. Its totient is φ = 321858415732.

The previous prime is 645922960411. The next prime is 645922960421. The reversal of 645922960418 is 814069229546.

It can be written as a sum of positive squares in only one way, i.e., 322961480209 + 322961480209 = 568297^2 + 568297^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=568297.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (645922960411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 408036455 + ... + 408038037.

Almost surely, 2^645922960418 is an apocalyptic number.

645922960418 is a deficient number, since it is larger than the sum of its proper divisors (326281993561).

645922960418 is an frugal number, since it uses more digits than its factorization.

645922960418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886 (or 1944 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 645922960418 in words is "six hundred forty-five billion, nine hundred twenty-two million, nine hundred sixty thousand, four hundred eighteen".