1560516661 has 4 divisors (see below), whose sum is σ = 1702381824. Its totient is φ = 1418651500.

The previous prime is 1560516653. The next prime is 1560516677. The reversal of 1560516661 is 1666150651.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1560516661 - 2³ = 1560516653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1560516661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1560510661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70932565 + ... + 70932586.

It is an arithmetic number, because the mean of its divisors is an integer number (425595456).

Almost surely, 2^1560516661 is an apocalyptic number.

1560516661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1560516661 is a deficient number, since it is larger than the sum of its proper divisors (141865163).

1560516661 is a wasteful number, since it uses less digits than its factorization.

1560516661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141865162.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1560516661 is about 39503.3753114845. The cubic root of 1560516661 is about 1159.9060221626.

The spelling of 1560516661 in words is "one billion, five hundred sixty million, five hundred sixteen thousand, six hundred sixty-one".