1565115656 has 32 divisors (see below), whose sum is σ = 3213907200. Its totient is φ = 710114880.

The previous prime is 1565115611. The next prime is 1565115667. The reversal of 1565115656 is 6565115651.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121400 + ... + 133671.

It is an arithmetic number, because the mean of its divisors is an integer number (100434600).

Almost surely, 2^1565115656 is an apocalyptic number.

It is an amenable number.

1565115656 is an abundant number, since it is smaller than the sum of its proper divisors (1648791544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1565115656 is a wasteful number, since it uses less digits than its factorization.

1565115656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255149 (or 255145 counting only the distinct ones).

The product of its digits is 135000, while the sum is 41.

The square root of 1565115656 is about 39561.5426392854. The cubic root of 1565115656 is about 1161.0443567407.

The spelling of 1565115656 in words is "one billion, five hundred sixty-five million, one hundred fifteen thousand, six hundred fifty-six".