1660718447 has 4 divisors (see below), whose sum is σ = 1661192040. Its totient is φ = 1660244856.

The previous prime is 1660718419. The next prime is 1660718459. The reversal of 1660718447 is 7448170661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7448170661 = 23 ⋅323833507.

It is a cyclic number.

It is not a de Polignac number, because 1660718447 - 2⁶ = 1660718383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1660718398 and 1660718407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660718747) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 231497 + ... + 238562.

It is an arithmetic number, because the mean of its divisors is an integer number (415298010).

Almost surely, 2^1660718447 is an apocalyptic number.

1660718447 is a deficient number, since it is larger than the sum of its proper divisors (473593).

1660718447 is an equidigital number, since it uses as much as digits as its factorization.

1660718447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473592.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 1660718447 is about 40751.9134152005. The cubic root of 1660718447 is about 1184.2189413471.

The spelling of 1660718447 in words is "one billion, six hundred sixty million, seven hundred eighteen thousand, four hundred forty-seven".