660015425 has 12 divisors (see below), whose sum is σ = 831837756. Its totient is φ = 519355200.

The previous prime is 660015401. The next prime is 660015427. The reversal of 660015425 is 524510066.

It can be written as a sum of positive squares in 6 ways, for example, as 164685889 + 495329536 = 12833^2 + 22256^2 .

It is not a de Polignac number, because 660015425 - 2¹⁰ = 660014401 is a prime.

It is a super-2 number, since 2×660015425² = 871240722475861250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660015427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214874 + ... + 217923.

It is an arithmetic number, because the mean of its divisors is an integer number (69319813).

Almost surely, 2^660015425 is an apocalyptic number.

It is an amenable number.

660015425 is a deficient number, since it is larger than the sum of its proper divisors (171822331).

660015425 is a wasteful number, since it uses less digits than its factorization.

660015425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432868 (or 432863 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 660015425 is about 25690.7653642316. The cubic root of 660015425 is about 870.6655518481.

The spelling of 660015425 in words is "six hundred sixty million, fifteen thousand, four hundred twenty-five".