551404404225 has 18 divisors (see below), whose sum is σ = 987626555526. Its totient is φ = 294082348800.

The previous prime is 551404404211. The next prime is 551404404283. The reversal of 551404404225 is 522404404155.

551404404225 is a `hidden beast` number, since 55 + 140 + 4 + 40 + 422 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 294156801 + 551110247424 = 17151^2 + 742368^2 .

It is not a de Polignac number, because 551404404225 - 2⁸ = 551404403969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551404404225.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1225342896 + ... + 1225343345.

Almost surely, 2^551404404225 is an apocalyptic number.

It is an amenable number.

551404404225 is a deficient number, since it is larger than the sum of its proper divisors (436222151301).

551404404225 is a wasteful number, since it uses less digits than its factorization.

551404404225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2450686257 (or 2450686249 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 36.

The spelling of 551404404225 in words is "five hundred fifty-one billion, four hundred four million, four hundred four thousand, two hundred twenty-five".