660380825 has 24 divisors (see below), whose sum is σ = 888651456. Its totient is φ = 483912000.

The previous prime is 660380813. The next prime is 660380843. The reversal of 660380825 is 528083066.

It is not a de Polignac number, because 660380825 - 2¹⁶ = 660315289 is a prime.

It is a super-2 number, since 2×660380825² = 872205668055361250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34820 + ... + 50330.

It is an arithmetic number, because the mean of its divisors is an integer number (37027144).

Almost surely, 2^660380825 is an apocalyptic number.

660380825 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

660380825 is a deficient number, since it is larger than the sum of its proper divisors (228270631).

660380825 is a wasteful number, since it uses less digits than its factorization.

660380825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15665 (or 15660 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 660380825 is about 25697.8758849832. The cubic root of 660380825 is about 870.8261958212.

The spelling of 660380825 in words is "six hundred sixty million, three hundred eighty thousand, eight hundred twenty-five".