645634353325 has 12 divisors (see below), whose sum is σ = 862170183028. Its totient is φ = 476776137600.

The previous prime is 645634353271. The next prime is 645634353337. The reversal of 645634353325 is 523353436546.

It is a happy number.

645634353325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 105143250564 + 540491102761 = 324258^2 + 735181^2 .

It is not a de Polignac number, because 645634353325 - 2¹⁷ = 645634222253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 993283296 + ... + 993283945.

Almost surely, 2^645634353325 is an apocalyptic number.

645634353325 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

645634353325 is a deficient number, since it is larger than the sum of its proper divisors (216535829703).

645634353325 is a wasteful number, since it uses less digits than its factorization.

645634353325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986567264 (or 1986567259 counting only the distinct ones).

The product of its digits is 11664000, while the sum is 49.

The spelling of 645634353325 in words is "six hundred forty-five billion, six hundred thirty-four million, three hundred fifty-three thousand, three hundred twenty-five".