645272127625 has 32 divisors (see below), whose sum is σ = 815159872800. Its totient is φ = 509908608000.

The previous prime is 645272127611. The next prime is 645272127649. The reversal of 645272127625 is 526721272546.

It can be written as a sum of positive squares in 16 ways, for example, as 641554542841 + 3717584784 = 800971^2 + 60972^2 .

It is not a de Polignac number, because 645272127625 - 2⁷ = 645272127497 is a prime.

It is a super-2 number, since 2×645272127625² (a number of 24 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 11330221 + ... + 11387029.

It is an arithmetic number, because the mean of its divisors is an integer number (25473746025).

Almost surely, 2^645272127625 is an apocalyptic number.

It is an amenable number.

645272127625 is a deficient number, since it is larger than the sum of its proper divisors (169887745175).

645272127625 is a wasteful number, since it uses less digits than its factorization.

645272127625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57934 (or 57924 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 49.

The spelling of 645272127625 in words is "six hundred forty-five billion, two hundred seventy-two million, one hundred twenty-seven thousand, six hundred twenty-five".