404640645025 has 12 divisors (see below), whose sum is σ = 513992313324. Its totient is φ = 315817088000.

The previous prime is 404640645001. The next prime is 404640645047. The reversal of 404640645025 is 520546046404.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 135479941776 + 269160703249 = 368076^2 + 518807^2 .

It is not a de Polignac number, because 404640645025 - 2¹³ = 404640636833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197384656 + ... + 197386705.

It is an arithmetic number, because the mean of its divisors is an integer number (42832692777).

Almost surely, 2^404640645025 is an apocalyptic number.

It is an amenable number.

404640645025 is a deficient number, since it is larger than the sum of its proper divisors (109351668299).

404640645025 is a wasteful number, since it uses less digits than its factorization.

404640645025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394771412 (or 394771407 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

The spelling of 404640645025 in words is "four hundred four billion, six hundred forty million, six hundred forty-five thousand, twenty-five".