1620963566 has 16 divisors (see below), whose sum is σ = 2576629440. Its totient is φ = 762167040.

The previous prime is 1620963559. The next prime is 1620963569. The reversal of 1620963566 is 6653690261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620963569) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22490 + ... + 61218.

It is an arithmetic number, because the mean of its divisors is an integer number (161039340).

Almost surely, 2^1620963566 is an apocalyptic number.

1620963566 is a deficient number, since it is larger than the sum of its proper divisors (955665874).

1620963566 is a wasteful number, since it uses less digits than its factorization.

1620963566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39979.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 1620963566 is about 40261.1918104767. The cubic root of 1620963566 is about 1174.6931001099.

The spelling of 1620963566 in words is "one billion, six hundred twenty million, nine hundred sixty-three thousand, five hundred sixty-six".