645628545826546 has 16 divisors (see below), whose sum is σ = 968518013389920. Its totient is φ = 322789208639040.

The previous prime is 645628545826499. The next prime is 645628545826553.

645628545826546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645628545826546² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3967182445 + ... + 3967345183.

It is an arithmetic number, because the mean of its divisors is an integer number (60532375836870).

Almost surely, 2^{645628545826546} is an apocalyptic number.

645628545826546 is a deficient number, since it is larger than the sum of its proper divisors (322889467563374).

645628545826546 is a wasteful number, since it uses less digits than its factorization.

645628545826546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304569.

The product of its digits is 13271040000, while the sum is 76.

The spelling of 645628545826546 in words is "six hundred forty-five trillion, six hundred twenty-eight billion, five hundred forty-five million, eight hundred twenty-six thousand, five hundred forty-six".