1706660561 has 2 divisors, whose sum is σ = 1706660562. Its totient is φ = 1706660560.

The previous prime is 1706660477. The next prime is 1706660581. The reversal of 1706660561 is 1650666071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1502027536 + 204633025 = 38756^2 + 14305^2 .

It is an emirp because it is prime and its reverse (1650666071) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1706660561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1706660581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 853330280 + 853330281.

It is an arithmetic number, because the mean of its divisors is an integer number (853330281).

Almost surely, 2^1706660561 is an apocalyptic number.

It is an amenable number.

1706660561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1706660561 is an equidigital number, since it uses as much as digits as its factorization.

1706660561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 1706660561 is about 41311.7484621506. The cubic root of 1706660561 is about 1195.0398406446.

The spelling of 1706660561 in words is "one billion, seven hundred six million, six hundred sixty thousand, five hundred sixty-one".