1566165616 has 20 divisors (see below), whose sum is σ = 3047820552. Its totient is φ = 779631296.

The previous prime is 1566165593. The next prime is 1566165617. The reversal of 1566165616 is 6165616651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566165617) 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, 211975 + ... + 219238.

Almost surely, 2^1566165616 is an apocalyptic number.

1566165616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1566165616 is a deficient number, since it is larger than the sum of its proper divisors (1481654936).

1566165616 is a wasteful number, since it uses less digits than its factorization.

1566165616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431448 (or 431442 counting only the distinct ones).

The product of its digits is 194400, while the sum is 43.

The square root of 1566165616 is about 39574.8103722557. The cubic root of 1566165616 is about 1161.3039281084.

The spelling of 1566165616 in words is "one billion, five hundred sixty-six million, one hundred sixty-five thousand, six hundred sixteen".