645411263125 has 20 divisors (see below), whose sum is σ = 826176823164. Its totient is φ = 503735600000.

The previous prime is 645411263117. The next prime is 645411263129. The reversal of 645411263125 is 521362114546.

It can be written as a sum of positive squares in 10 ways, for example, as 514441824516 + 130969438609 = 717246^2 + 361897^2 .

It is not a de Polignac number, because 645411263125 - 2³ = 645411263117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645411263129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12567766 + ... + 12619015.

Almost surely, 2^645411263125 is an apocalyptic number.

It is an amenable number.

645411263125 is a deficient number, since it is larger than the sum of its proper divisors (180765560039).

645411263125 is an equidigital number, since it uses as much as digits as its factorization.

645411263125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25186842 (or 25186827 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The spelling of 645411263125 in words is "six hundred forty-five billion, four hundred eleven million, two hundred sixty-three thousand, one hundred twenty-five".