1660069 has 2 divisors, whose sum is σ = 1660070. Its totient is φ = 1660068.

The previous prime is 1660063. The next prime is 1660073. The reversal of 1660069 is 9600661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 471969 = 1090^2 + 687^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660069 - 2⁵ = 1660037 is a prime.

It is a super-2 number, since 2×1660069² = 5511658169522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830034 + 830035.

It is an arithmetic number, because the mean of its divisors is an integer number (830035).

2^1660069 is an apocalyptic number.

It is an amenable number.

1660069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660069 is an equidigital number, since it uses as much as digits as its factorization.

1660069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 1660069 is about 1288.4366495874. The cubic root of 1660069 is about 118.4064552802.

The spelling of 1660069 in words is "one million, six hundred sixty thousand, sixty-nine".