551665520225 has 12 divisors (see below), whose sum is σ = 702553496124. Its totient is φ = 429404512320.

The previous prime is 551665520213. The next prime is 551665520227. The reversal of 551665520225 is 522025566155.

It can be written as a sum of positive squares in 6 ways, for example, as 53771580769 + 497893939456 = 231887^2 + 705616^2 .

It is not a de Polignac number, because 551665520225 - 2¹⁴ = 551665503841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551665520227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 298196654 + ... + 298198503.

It is an arithmetic number, because the mean of its divisors is an integer number (58546124677).

Almost surely, 2^551665520225 is an apocalyptic number.

It is an amenable number.

551665520225 is a deficient number, since it is larger than the sum of its proper divisors (150887975899).

551665520225 is a wasteful number, since it uses less digits than its factorization.

551665520225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596395204 (or 596395199 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 551665520225 in words is "five hundred fifty-one billion, six hundred sixty-five million, five hundred twenty thousand, two hundred twenty-five".