8525409773 has 4 divisors (see below), whose sum is σ = 8529401340. Its totient is φ = 8521418208.

The previous prime is 8525409757. The next prime is 8525409779. The reversal of 8525409773 is 3779045258.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3901001764 + 4624408009 = 62458^2 + 68003^2 .

It is a cyclic number.

It is not a de Polignac number, because 8525409773 - 2⁴ = 8525409757 is a prime.

It is a super-2 number, since 2×8525409773² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8525409779) 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, 1992578 + ... + 1996851.

It is an arithmetic number, because the mean of its divisors is an integer number (2132350335).

Almost surely, 2^8525409773 is an apocalyptic number.

It is an amenable number.

8525409773 is a deficient number, since it is larger than the sum of its proper divisors (3991567).

8525409773 is a wasteful number, since it uses less digits than its factorization.

8525409773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991566.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The square root of 8525409773 is about 92333.1455816382. The cubic root of 8525409773 is about 2042.8591343693.

The spelling of 8525409773 in words is "eight billion, five hundred twenty-five million, four hundred nine thousand, seven hundred seventy-three".