7645523421 has 16 divisors (see below), whose sum is σ = 10503057600. Its totient is φ = 4943940480.

The previous prime is 7645523393. The next prime is 7645523461. The reversal of 7645523421 is 1243255467.

It is not a de Polignac number, because 7645523421 - 2¹⁰ = 7645522397 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7645523421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7645523461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158371 + ... + 200928.

It is an arithmetic number, because the mean of its divisors is an integer number (656441100).

Almost surely, 2^7645523421 is an apocalyptic number.

It is an amenable number.

7645523421 is a deficient number, since it is larger than the sum of its proper divisors (2857534179).

7645523421 is a wasteful number, since it uses less digits than its factorization.

7645523421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359516.

The product of its digits is 201600, while the sum is 39.

The square root of 7645523421 is about 87438.6837789774. The cubic root of 7645523421 is about 1970.0129196847.

Adding to 7645523421 its reverse (1243255467), we get a palindrome (8888778888).

The spelling of 7645523421 in words is "seven billion, six hundred forty-five million, five hundred twenty-three thousand, four hundred twenty-one".