645704260052 has 24 divisors (see below), whose sum is σ = 1134648829440. Its totient is φ = 321520861280.

The previous prime is 645704260039. The next prime is 645704260057. The reversal of 645704260052 is 250062407546.

It is a junction number, because it is equal to n+sod(n) for n = 645704259991 and 645704260009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645704260057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060349 + ... + 1554267.

It is an arithmetic number, because the mean of its divisors is an integer number (47277034560).

Almost surely, 2^645704260052 is an apocalyptic number.

It is an amenable number.

645704260052 is a deficient number, since it is larger than the sum of its proper divisors (488944569388).

645704260052 is a wasteful number, since it uses less digits than its factorization.

645704260052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495271 (or 495269 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

Adding to 645704260052 its reverse (250062407546), we get a palindrome (895766667598).

The spelling of 645704260052 in words is "six hundred forty-five billion, seven hundred four million, two hundred sixty thousand, fifty-two".