1660210625 has 10 divisors (see below), whose sum is σ = 2074599978. Its totient is φ = 1328168000.

The previous prime is 1660210619. The next prime is 1660210649. The reversal of 1660210625 is 5260120661.

It can be written as a sum of positive squares in 5 ways, for example, as 329930896 + 1330279729 = 18164^2 + 36473^2 .

It is not a de Polignac number, because 1660210625 - 2¹⁶ = 1660145089 is a prime.

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, 1327544 + ... + 1328793.

Almost surely, 2^1660210625 is an apocalyptic number.

It is an amenable number.

1660210625 is a deficient number, since it is larger than the sum of its proper divisors (414389353).

1660210625 is an frugal number, since it uses more digits than its factorization.

1660210625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2656357 (or 2656342 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1660210625 is about 40745.6822865933. The cubic root of 1660210625 is about 1184.0982237666.

The spelling of 1660210625 in words is "one billion, six hundred sixty million, two hundred ten thousand, six hundred twenty-five".