645674476546 has 8 divisors (see below), whose sum is σ = 1056558234384. Its totient is φ = 293488398420.

The previous prime is 645674476507. The next prime is 645674476549.

It is a happy number.

645674476546 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×645674476546² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645674476549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14674419900 + ... + 14674419943.

It is an arithmetic number, because the mean of its divisors is an integer number (132069779298).

Almost surely, 2^645674476546 is an apocalyptic number.

645674476546 is a deficient number, since it is larger than the sum of its proper divisors (410883757838).

645674476546 is a wasteful number, since it uses less digits than its factorization.

645674476546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29348839856.

The product of its digits is 406425600, while the sum is 64.

The spelling of 645674476546 in words is "six hundred forty-five billion, six hundred seventy-four million, four hundred seventy-six thousand, five hundred forty-six".