645856658546 has 32 divisors (see below), whose sum is σ = 1058112961920. Its totient is φ = 293222390400.

The previous prime is 645856658521. The next prime is 645856658597.

It is a happy number.

645856658546 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78462251 + ... + 78470481.

It is an arithmetic number, because the mean of its divisors is an integer number (33066030060).

Almost surely, 2^645856658546 is an apocalyptic number.

645856658546 is a deficient number, since it is larger than the sum of its proper divisors (412256303374).

645856658546 is a wasteful number, since it uses less digits than its factorization.

645856658546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12050.

The product of its digits is 829440000, while the sum is 68.

The spelling of 645856658546 in words is "six hundred forty-five billion, eight hundred fifty-six million, six hundred fifty-eight thousand, five hundred forty-six".