660381625 has 16 divisors (see below), whose sum is σ = 826235280. Its totient is φ = 526972800.

The previous prime is 660381607. The next prime is 660381641. The reversal of 660381625 is 526183066.

It can be written as a sum of positive squares in 8 ways, for example, as 72658576 + 587723049 = 8524^2 + 24243^2 .

It is not a de Polignac number, because 660381625 - 2⁵ = 660381593 is a prime.

It is a super-2 number, since 2×660381625² = 872207781275281250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44667 + ... + 57583.

It is an arithmetic number, because the mean of its divisors is an integer number (51639705).

Almost surely, 2^660381625 is an apocalyptic number.

It is an amenable number.

660381625 is a deficient number, since it is larger than the sum of its proper divisors (165853655).

660381625 is a wasteful number, since it uses less digits than its factorization.

660381625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13341 (or 13331 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 660381625 is about 25697.8914504673. The cubic root of 660381625 is about 870.8265474671.

The spelling of 660381625 in words is "six hundred sixty million, three hundred eighty-one thousand, six hundred twenty-five".