660228025 has 6 divisors (see below), whose sum is σ = 818682782. Its totient is φ = 528182400.

The previous prime is 660228013. The next prime is 660228029. The reversal of 660228025 is 520822066.

It can be written as a sum of positive squares in 3 ways, for example, as 216325264 + 443902761 = 14708^2 + 21069^2 .

It is not a de Polignac number, because 660228025 - 2⁵ = 660227993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660228029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13204536 + ... + 13204585.

Almost surely, 2^660228025 is an apocalyptic number.

It is an amenable number.

660228025 is a deficient number, since it is larger than the sum of its proper divisors (158454757).

660228025 is a wasteful number, since it uses less digits than its factorization.

660228025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26409131 (or 26409126 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 660228025 is about 25694.9027046222. The cubic root of 660228025 is about 870.7590262418.

It can be divided in two parts, 66022 and 8025, that added together give a palindrome (74047).

The spelling of 660228025 in words is "six hundred sixty million, two hundred twenty-eight thousand, twenty-five".