645376673546 has 32 divisors (see below), whose sum is σ = 1118254750848. Its totient is φ = 276081661440.

The previous prime is 645376673527. The next prime is 645376673549.

645376673546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645376673546² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645376673549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8978726 + ... + 9050318.

It is an arithmetic number, because the mean of its divisors is an integer number (34945460964).

Almost surely, 2^645376673546 is an apocalyptic number.

645376673546 is a deficient number, since it is larger than the sum of its proper divisors (472878077302).

645376673546 is a wasteful number, since it uses less digits than its factorization.

645376673546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95726.

The product of its digits is 228614400, while the sum is 62.

The spelling of 645376673546 in words is "six hundred forty-five billion, three hundred seventy-six million, six hundred seventy-three thousand, five hundred forty-six".