551239427025 has 135 divisors (see below), whose sum is σ = 1188298041249. Its totient is φ = 251888253120.

The previous prime is 551239427023. The next prime is 551239427077. The reversal of 551239427025 is 520724932155.

The square root of 551239427025 is 742455.

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

551239427025 is a `hidden beast` number, since 5 + 512 + 3 + 9 + 42 + 70 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 120630487761 + 430608939264 = 347319^2 + 656208^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 551239427025 - 2¹ = 551239427023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551239427023) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 233872147 + ... + 233874503.

Almost surely, 2^551239427025 is an apocalyptic number.

551239427025 is the 742455-th square number.

551239427025 is the 371228-th centered octagonal number.

It is an amenable number.

551239427025 is an abundant number, since it is smaller than the sum of its proper divisors (637058614224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551239427025 is an frugal number, since it uses more digits than its factorization.

551239427025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4750 (or 2372 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 551239427025 in words is "five hundred fifty-one billion, two hundred thirty-nine million, four hundred twenty-seven thousand, twenty-five".