1660870225 has 12 divisors (see below), whose sum is σ = 2353690624. Its totient is φ = 1138882320.

The previous prime is 1660870219. The next prime is 1660870247. The reversal of 1660870225 is 5220780661.

It is a happy number.

It is not a de Polignac number, because 1660870225 - 2²¹ = 1658773073 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 4745169 + ... + 4745518.

Almost surely, 2^1660870225 is an apocalyptic number.

It is an amenable number.

1660870225 is a deficient number, since it is larger than the sum of its proper divisors (692820399).

1660870225 is an equidigital number, since it uses as much as digits as its factorization.

1660870225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9490704 (or 9490699 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1660870225 is about 40753.7755919620. The cubic root of 1660870225 is about 1184.2550166789.

The spelling of 1660870225 in words is "one billion, six hundred sixty million, eight hundred seventy thousand, two hundred twenty-five".