8209403638725 has 24 divisors (see below), whose sum is σ = 13736409376032. Its totient is φ = 4325597416000.

The previous prime is 8209403638679. The next prime is 8209403638739. The reversal of 8209403638725 is 5278363049028.

It is not a de Polignac number, because 8209403638725 - 2²¹ = 8209401541573 is a prime.

It is a super-2 number, since 2×8209403638725² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

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, 659383626 + ... + 659396075.

It is an arithmetic number, because the mean of its divisors is an integer number (572350390668).

Almost surely, 2^{8209403638725} is an apocalyptic number.

It is an amenable number.

8209403638725 is a deficient number, since it is larger than the sum of its proper divisors (5527005737307).

8209403638725 is a wasteful number, since it uses less digits than its factorization.

8209403638725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318779797 (or 1318779792 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 57.

The spelling of 8209403638725 in words is "eight trillion, two hundred nine billion, four hundred three million, six hundred thirty-eight thousand, seven hundred twenty-five".