1066021603 has 4 divisors (see below), whose sum is σ = 1066476240. Its totient is φ = 1065566968.

The previous prime is 1066021559. The next prime is 1066021609. The reversal of 1066021603 is 3061206601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3061206601 = 73 ⋅41934337.

It is a cyclic number.

It is not a de Polignac number, because 1066021603 - 2²⁹ = 529150691 is a prime.

It is a super-2 number, since 2×1066021603² = 2272804116125379218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066021609) 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 3 ways as a sum of consecutive naturals, for example, 223783 + ... + 228496.

It is an arithmetic number, because the mean of its divisors is an integer number (266619060).

Almost surely, 2^1066021603 is an apocalyptic number.

1066021603 is a deficient number, since it is larger than the sum of its proper divisors (454637).

1066021603 is an equidigital number, since it uses as much as digits as its factorization.

1066021603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454636.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1066021603 is about 32649.9862633968. The cubic root of 1066021603 is about 1021.5399023366.

The spelling of 1066021603 in words is "one billion, sixty-six million, twenty-one thousand, six hundred three".