1560385661 has 2 divisors, whose sum is σ = 1560385662. Its totient is φ = 1560385660.

The previous prime is 1560385657. The next prime is 1560385787. The reversal of 1560385661 is 1665830651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1224580036 + 335805625 = 34994^2 + 18325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1560385661 - 2² = 1560385657 is a prime.

It is a super-2 number, since 2×1560385661² = 4869606822108813842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1560385361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780192830 + 780192831.

It is an arithmetic number, because the mean of its divisors is an integer number (780192831).

Almost surely, 2^1560385661 is an apocalyptic number.

It is an amenable number.

1560385661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1560385661 is an equidigital number, since it uses as much as digits as its factorization.

1560385661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 1560385661 is about 39501.7171905222. The cubic root of 1560385661 is about 1159.8735645489.

The spelling of 1560385661 in words is "one billion, five hundred sixty million, three hundred eighty-five thousand, six hundred sixty-one".