1566615516 has 12 divisors (see below), whose sum is σ = 3655436232. Its totient is φ = 522205168.

The previous prime is 1566615509. The next prime is 1566615527. The reversal of 1566615516 is 6155166651.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65275635 + ... + 65275658.

It is an arithmetic number, because the mean of its divisors is an integer number (304619686).

Almost surely, 2^1566615516 is an apocalyptic number.

It is an amenable number.

1566615516 is an abundant number, since it is smaller than the sum of its proper divisors (2088820716).

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

1566615516 is a wasteful number, since it uses less digits than its factorization.

1566615516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130551300 (or 130551298 counting only the distinct ones).

The product of its digits is 162000, while the sum is 42.

The square root of 1566615516 is about 39580.4941353693. The cubic root of 1566615516 is about 1161.4151169914.

The spelling of 1566615516 in words is "one billion, five hundred sixty-six million, six hundred fifteen thousand, five hundred sixteen".