660385625 has 10 divisors (see below), whose sum is σ = 825218658. Its totient is φ = 528308000.

The previous prime is 660385613. The next prime is 660385639. The reversal of 660385625 is 526583066.

It can be written as a sum of positive squares in 5 ways, for example, as 490135321 + 170250304 = 22139^2 + 13048^2 .

It is a de Polignac number, because none of the positive numbers 2^k-660385625 is a prime.

It is a super-2 number, since 2×660385625² = 872218347413281250, 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 9 ways as a sum of consecutive naturals, for example, 527684 + ... + 528933.

Almost surely, 2^660385625 is an apocalyptic number.

It is an amenable number.

660385625 is a deficient number, since it is larger than the sum of its proper divisors (164833033).

660385625 is an equidigital number, since it uses as much as digits as its factorization.

660385625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056637 (or 1056622 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 660385625 is about 25697.9692777464. The cubic root of 660385625 is about 870.8283056925.

The spelling of 660385625 in words is "six hundred sixty million, three hundred eighty-five thousand, six hundred twenty-five".