645634350543 has 32 divisors (see below), whose sum is σ = 1096037107200. Its totient is φ = 328811124096.

The previous prime is 645634350511. The next prime is 645634350611. The reversal of 645634350543 is 345053436546.

It is not a de Polignac number, because 645634350543 - 2⁵ = 645634350511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645634350492 and 645634350501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645634350503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40767273 + ... + 40783106.

It is an arithmetic number, because the mean of its divisors is an integer number (34251159600).

Almost surely, 2^645634350543 is an apocalyptic number.

645634350543 is a deficient number, since it is larger than the sum of its proper divisors (450402756657).

645634350543 is a wasteful number, since it uses less digits than its factorization.

645634350543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81550431.

The product of its (nonzero) digits is 7776000, while the sum is 48.

The spelling of 645634350543 in words is "six hundred forty-five billion, six hundred thirty-four million, three hundred fifty thousand, five hundred forty-three".