645301844132 has 36 divisors (see below), whose sum is σ = 1241349017580. Its totient is φ = 293301000960.

The previous prime is 645301844111. The next prime is 645301844167. The reversal of 645301844132 is 231448103546.

It can be written as a sum of positive squares in 2 ways, for example, as 368905605376 + 276396238756 = 607376^2 + 525734^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 645301844132.

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, 10816208 + ... + 10875704.

It is an arithmetic number, because the mean of its divisors is an integer number (34481917155).

Almost surely, 2^645301844132 is an apocalyptic number.

It is an amenable number.

645301844132 is a deficient number, since it is larger than the sum of its proper divisors (596047173448).

645301844132 is a wasteful number, since it uses less digits than its factorization.

645301844132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81932 (or 81919 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

Adding to 645301844132 its reverse (231448103546), we get a palindrome (876749947678).

The spelling of 645301844132 in words is "six hundred forty-five billion, three hundred one million, eight hundred forty-four thousand, one hundred thirty-two".