645353353546 has 32 divisors (see below), whose sum is σ = 1057613760000. Its totient is φ = 292903591680.

The previous prime is 645353353531. The next prime is 645353353583.

645353353546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645353353493 and 645353353502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49449630 + ... + 49462678.

It is an arithmetic number, because the mean of its divisors is an integer number (33050430000).

Almost surely, 2^645353353546 is an apocalyptic number.

645353353546 is a deficient number, since it is larger than the sum of its proper divisors (412260406454).

645353353546 is a wasteful number, since it uses less digits than its factorization.

645353353546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16254.

The product of its digits is 29160000, while the sum is 52.

It can be divided in two parts, 645353 and 353546, that added together give a palindrome (998899).

The spelling of 645353353546 in words is "six hundred forty-five billion, three hundred fifty-three million, three hundred fifty-three thousand, five hundred forty-six".