645875231525 has 6 divisors (see below), whose sum is σ = 800885287122. Its totient is φ = 516700185200.

The previous prime is 645875231513. The next prime is 645875231539. The reversal of 645875231525 is 525132578546.

It can be written as a sum of positive squares in 3 ways, for example, as 62964359329 + 582910872196 = 250927^2 + 763486^2 .

It is not a de Polignac number, because 645875231525 - 2²⁴ = 645858454309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12917504606 + ... + 12917504655.

It is an arithmetic number, because the mean of its divisors is an integer number (133480881187).

Almost surely, 2^645875231525 is an apocalyptic number.

It is an amenable number.

645875231525 is a deficient number, since it is larger than the sum of its proper divisors (155010055597).

645875231525 is a wasteful number, since it uses less digits than its factorization.

645875231525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25835009271 (or 25835009266 counting only the distinct ones).

The product of its digits is 10080000, while the sum is 53.

The spelling of 645875231525 in words is "six hundred forty-five billion, eight hundred seventy-five million, two hundred thirty-one thousand, five hundred twenty-five".