7725505643 has 4 divisors (see below), whose sum is σ = 7726139448. Its totient is φ = 7724871840.

The previous prime is 7725505591. The next prime is 7725505651. The reversal of 7725505643 is 3465055277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3465055277 = 17 ⋅203826781.

It is a cyclic number.

It is not a de Polignac number, because 7725505643 - 2⁸ = 7725505387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7725505594 and 7725505603.

It is not an unprimeable number, because it can be changed into a prime (7725505043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298253 + ... + 323118.

It is an arithmetic number, because the mean of its divisors is an integer number (1931534862).

Almost surely, 2^7725505643 is an apocalyptic number.

7725505643 is a deficient number, since it is larger than the sum of its proper divisors (633805).

7725505643 is a wasteful number, since it uses less digits than its factorization.

7725505643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633804.

The product of its (nonzero) digits is 882000, while the sum is 44.

The square root of 7725505643 is about 87894.8556116909. The cubic root of 7725505643 is about 1976.8587441004.

The spelling of 7725505643 in words is "seven billion, seven hundred twenty-five million, five hundred five thousand, six hundred forty-three".