660719 has 2 divisors, whose sum is σ = 660720. Its totient is φ = 660718.

The previous prime is 660683. The next prime is 660727. The reversal of 660719 is 917066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660719 - 2¹⁶ = 595183 is a prime.

It is a super-2 number, since 2×660719² = 873099193922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660691 and 660700.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660719.

It is not a weakly prime, because it can be changed into another prime (660769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330359 + 330360.

It is an arithmetic number, because the mean of its divisors is an integer number (330360).

2⁶⁶⁰⁷¹⁹ is an apocalyptic number.

660719 is a deficient number, since it is larger than the sum of its proper divisors (1).

660719 is an equidigital number, since it uses as much as digits as its factorization.

660719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 660719 is about 812.8462339213. The cubic root of 660719 is about 87.0974817840.

The spelling of 660719 in words is "six hundred sixty thousand, seven hundred nineteen".