1706655661 has 2 divisors, whose sum is σ = 1706655662. Its totient is φ = 1706655660.

The previous prime is 1706655659. The next prime is 1706655701. The reversal of 1706655661 is 1665566071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1112222500 + 594433161 = 33350^2 + 24381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1706655661 - 2¹ = 1706655659 is a prime.

Together with 1706655659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1706655061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 853327830 + 853327831.

It is an arithmetic number, because the mean of its divisors is an integer number (853327831).

Almost surely, 2^1706655661 is an apocalyptic number.

It is an amenable number.

1706655661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1706655661 is an equidigital number, since it uses as much as digits as its factorization.

1706655661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 1706655661 is about 41311.6891569444. The cubic root of 1706655661 is about 1195.0386969489.

It can be divided in two parts, 17066 and 55661, that added together give a palindrome (72727).

The spelling of 1706655661 in words is "one billion, seven hundred six million, six hundred fifty-five thousand, six hundred sixty-one".