1020566643 has 8 divisors (see below), whose sum is σ = 1361850000. Its totient is φ = 679830528.

The previous prime is 1020566641. The next prime is 1020566653. The reversal of 1020566643 is 3466650201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020566643 - 2¹ = 1020566641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020566641) 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, 132438 + ... + 139931.

It is an arithmetic number, because the mean of its divisors is an integer number (170231250).

Almost surely, 2^1020566643 is an apocalyptic number.

1020566643 is a deficient number, since it is larger than the sum of its proper divisors (341283357).

1020566643 is a wasteful number, since it uses less digits than its factorization.

1020566643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273621.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 1020566643 is about 31946.3087539077. The cubic root of 1020566643 is about 1006.8090788804.

The spelling of 1020566643 in words is "one billion, twenty million, five hundred sixty-six thousand, six hundred forty-three".