645488884546 has 32 divisors (see below), whose sum is σ = 1072999975680. Its totient is φ = 288775968000.

The previous prime is 645488884541. The next prime is 645488884549.

645488884546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645488884546² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645488884541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34855 + ... + 1136746.

It is an arithmetic number, because the mean of its divisors is an integer number (33531249240).

Almost surely, 2^645488884546 is an apocalyptic number.

645488884546 is a deficient number, since it is larger than the sum of its proper divisors (427511091134).

645488884546 is a wasteful number, since it uses less digits than its factorization.

645488884546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172010.

The product of its digits is 943718400, while the sum is 70.

The spelling of 645488884546 in words is "six hundred forty-five billion, four hundred eighty-eight million, eight hundred eighty-four thousand, five hundred forty-six".