4404021664525 has 24 divisors (see below), whose sum is σ = 6244453365120. Its totient is φ = 3018291447360.

The previous prime is 4404021664519. The next prime is 4404021664543. The reversal of 4404021664525 is 5254661204044.

It is not a de Polignac number, because 4404021664525 - 2³ = 4404021664517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6375265 + ... + 7032214.

It is an arithmetic number, because the mean of its divisors is an integer number (260185556880).

Almost surely, 2^{4404021664525} is an apocalyptic number.

It is an amenable number.

4404021664525 is a deficient number, since it is larger than the sum of its proper divisors (1840431700595).

4404021664525 is a wasteful number, since it uses less digits than its factorization.

4404021664525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13409373 (or 13409368 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 43.

Adding to 4404021664525 its reverse (5254661204044), we get a palindrome (9658682868569).

The spelling of 4404021664525 in words is "four trillion, four hundred four billion, twenty-one million, six hundred sixty-four thousand, five hundred twenty-five".