645334433545 has 8 divisors (see below), whose sum is σ = 787526766720. Its totient is φ = 507517249200.

The previous prime is 645334433519. The next prime is 645334433551. The reversal of 645334433545 is 545334433546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645334433545 - 2⁷ = 645334433417 is a prime.

It is a super-2 number, since 2×645334433545² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093786881 + ... + 1093787470.

It is an arithmetic number, because the mean of its divisors is an integer number (98440845840).

Almost surely, 2^645334433545 is an apocalyptic number.

It is an amenable number.

645334433545 is a deficient number, since it is larger than the sum of its proper divisors (142192333175).

645334433545 is a wasteful number, since it uses less digits than its factorization.

645334433545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187574415.

The product of its digits is 15552000, while the sum is 49.

Subtracting from 645334433545 its reverse (545334433546), we obtain a palindrome (99999999999).

The spelling of 645334433545 in words is "six hundred forty-five billion, three hundred thirty-four million, four hundred thirty-three thousand, five hundred forty-five".