645862268546 has 16 divisors (see below), whose sum is σ = 1057782194208. Its totient is φ = 293319129600.

The previous prime is 645862268543. The next prime is 645862268587.

It is a happy number.

645862268546 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (645862268543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12705500 + ... + 12756231.

It is an arithmetic number, because the mean of its divisors is an integer number (66111387138).

Almost surely, 2^645862268546 is an apocalyptic number.

645862268546 is a deficient number, since it is larger than the sum of its proper divisors (411919925662).

645862268546 is a wasteful number, since it uses less digits than its factorization.

645862268546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25462897.

The product of its digits is 132710400, while the sum is 62.

The spelling of 645862268546 in words is "six hundred forty-five billion, eight hundred sixty-two million, two hundred sixty-eight thousand, five hundred forty-six".