1560015661 has 2 divisors, whose sum is σ = 1560015662. Its totient is φ = 1560015660.

The previous prime is 1560015643. The next prime is 1560015671. The reversal of 1560015661 is 1665100651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1101841636 + 458174025 = 33194^2 + 21405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1560015661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1560015631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780007830 + 780007831.

It is an arithmetic number, because the mean of its divisors is an integer number (780007831).

Almost surely, 2^1560015661 is an apocalyptic number.

It is an amenable number.

1560015661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1560015661 is an equidigital number, since it uses as much as digits as its factorization.

1560015661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1560015661 is about 39497.0335721558. The cubic root of 1560015661 is about 1159.7818805602.

The spelling of 1560015661 in words is "one billion, five hundred sixty million, fifteen thousand, six hundred sixty-one".