645751343157545 has 16 divisors (see below), whose sum is σ = 781013359976448. Its totient is φ = 512526681576000.

The previous prime is 645751343157539. The next prime is 645751343157559. The reversal of 645751343157545 is 545751343157546.

It is a de Polignac number, because none of the positive numbers 2^k-645751343157545 is a prime.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 42519920 + ... + 55672670.

It is an arithmetic number, because the mean of its divisors is an integer number (48813334998528).

Almost surely, 2^{645751343157545} is an apocalyptic number.

It is an amenable number.

645751343157545 is a deficient number, since it is larger than the sum of its proper divisors (135262016818903).

645751343157545 is a wasteful number, since it uses less digits than its factorization.

645751343157545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13230200.

The product of its digits is 529200000, while the sum is 65.

Subtracting from 645751343157545 its reverse (545751343157546), we obtain a palindrome (99999999999999).

The spelling of 645751343157545 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-five".