645543525345546 has 64 divisors (see below), whose sum is σ = 1411215605369856. Its totient is φ = 195978720844800.

The previous prime is 645543525345533. The next prime is 645543525345547.

645543525345546 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (645543525345547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46837536 + ... + 59032548.

It is an arithmetic number, because the mean of its divisors is an integer number (22050243833904).

Almost surely, 2^{645543525345546} is an apocalyptic number.

645543525345546 is an abundant number, since it is smaller than the sum of its proper divisors (765672080024310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645543525345546 is a wasteful number, since it uses less digits than its factorization.

645543525345546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12211807.

The product of its digits is 2592000000, while the sum is 66.

The spelling of 645543525345546 in words is "six hundred forty-five trillion, five hundred forty-three billion, five hundred twenty-five million, three hundred forty-five thousand, five hundred forty-six".