7812816205 has 8 divisors (see below), whose sum is σ = 9376250904. Its totient is φ = 6249672000.

The previous prime is 7812816197. The next prime is 7812816211. The reversal of 7812816205 is 5026182187.

It can be written as a sum of positive squares in 4 ways, for example, as 1499083524 + 6313732681 = 38718^2 + 79459^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7812816205 - 2³ = 7812816197 is a prime.

It is a super-2 number, since 2×7812816205² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8266 + ... + 125275.

It is an arithmetic number, because the mean of its divisors is an integer number (1172031363).

Almost surely, 2^7812816205 is an apocalyptic number.

It is an amenable number.

7812816205 is a deficient number, since it is larger than the sum of its proper divisors (1563434699).

7812816205 is a wasteful number, since it uses less digits than its factorization.

7812816205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145247.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 7812816205 is about 88390.1363558174. The cubic root of 7812816205 is about 1984.2780849537.

The spelling of 7812816205 in words is "seven billion, eight hundred twelve million, eight hundred sixteen thousand, two hundred five".