645445544546 has 32 divisors (see below), whose sum is σ = 1122779949120. Its totient is φ = 275191128000.

The previous prime is 645445544483. The next prime is 645445544551.

645445544546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645445544546² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645445544491 and 645445544500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7601981 + ... + 7686416.

It is an arithmetic number, because the mean of its divisors is an integer number (35086873410).

Almost surely, 2^645445544546 is an apocalyptic number.

645445544546 is a deficient number, since it is larger than the sum of its proper divisors (477334404574).

645445544546 is a wasteful number, since it uses less digits than its factorization.

645445544546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15288530.

The product of its digits is 92160000, while the sum is 56.

The spelling of 645445544546 in words is "six hundred forty-five billion, four hundred forty-five million, five hundred forty-four thousand, five hundred forty-six".