645170274770567 has 16 divisors (see below), whose sum is σ = 794159535355200. Its totient is φ = 510397656579072.

The previous prime is 645170274770533. The next prime is 645170274770587. The reversal of 645170274770567 is 765077472071546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 645170274770567 - 2¹⁸ = 645170274508423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645170274770497 and 645170274770506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645170274770587) 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 15 ways as a sum of consecutive naturals, for example, 462749048 + ... + 464141165.

It is an arithmetic number, because the mean of its divisors is an integer number (49634970959700).

Almost surely, 2^{645170274770567} is an apocalyptic number.

645170274770567 is a deficient number, since it is larger than the sum of its proper divisors (148989260584633).

645170274770567 is a wasteful number, since it uses less digits than its factorization.

645170274770567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926897882.

The product of its (nonzero) digits is 484041600, while the sum is 68.

The spelling of 645170274770567 in words is "six hundred forty-five trillion, one hundred seventy billion, two hundred seventy-four million, seven hundred seventy thousand, five hundred sixty-seven".