51069220225 has 9 divisors (see below), whose sum is σ = 63327234217. Its totient is φ = 40854472240.

The previous prime is 51069220199. The next prime is 51069220253. The reversal of 51069220225 is 52202296015.

The square root of 51069220225 is 225985.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 7681996609 + 43387223616 = 87647^2 + 208296^2 .

It is not a de Polignac number, because 51069220225 - 2⁵ = 51069220193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1107327 + ... + 1152523.

Almost surely, 2^51069220225 is an apocalyptic number.

51069220225 is the 225985-th square number.

51069220225 is the 112993-rd centered octagonal number.

It is an amenable number.

51069220225 is a deficient number, since it is larger than the sum of its proper divisors (12258013992).

51069220225 is an frugal number, since it uses more digits than its factorization.

51069220225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90404 (or 45202 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 51069220225 in words is "fifty-one billion, sixty-nine million, two hundred twenty thousand, two hundred twenty-five".