645751343157546 has 16 divisors (see below), whose sum is σ = 1326408164324064. Its totient is φ = 209432868051024.

The previous prime is 645751343157539. The next prime is 645751343157559.

It is a happy number.

645751343157546 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454394916800 + ... + 1454394917243.

It is an arithmetic number, because the mean of its divisors is an integer number (82900510270254).

Almost surely, 2^{645751343157546} is an apocalyptic number.

645751343157546 is an abundant number, since it is smaller than the sum of its proper divisors (680656821166518).

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

645751343157546 is a wasteful number, since it uses less digits than its factorization.

645751343157546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908789834085.

The product of its digits is 635040000, while the sum is 66.

The spelling of 645751343157546 in words is "six hundred forty-five trillion, seven hundred fifty-one billion, three hundred forty-three million, one hundred fifty-seven thousand, five hundred forty-six".