645650616359 has 16 divisors (see below), whose sum is σ = 770455699200. Its totient is φ = 540544689720.

The previous prime is 645650616293. The next prime is 645650616407. The reversal of 645650616359 is 953616056546.

It is a happy number.

It is not a de Polignac number, because 645650616359 - 2²⁴ = 645633839143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645650616959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21873197 + ... + 21902694.

It is an arithmetic number, because the mean of its divisors is an integer number (48153481200).

Almost surely, 2^645650616359 is an apocalyptic number.

645650616359 is a deficient number, since it is larger than the sum of its proper divisors (124805082841).

645650616359 is an equidigital number, since it uses as much as digits as its factorization.

645650616359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43775955 (or 43775941 counting only the distinct ones).

The product of its (nonzero) digits is 17496000, while the sum is 56.

The spelling of 645650616359 in words is "six hundred forty-five billion, six hundred fifty million, six hundred sixteen thousand, three hundred fifty-nine".