1066643420 has 24 divisors (see below), whose sum is σ = 2242747248. Its totient is φ = 426124800.

The previous prime is 1066643401. The next prime is 1066643429. The reversal of 1066643420 is 243466601.

It is a super-2 number, since 2×1066643420² = 2275456370858592800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066643429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16661 + ... + 49100.

It is an arithmetic number, because the mean of its divisors is an integer number (93447802).

Almost surely, 2^1066643420 is an apocalyptic number.

1066643420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1066643420 is an abundant number, since it is smaller than the sum of its proper divisors (1176103828).

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

1066643420 is a wasteful number, since it uses less digits than its factorization.

1066643420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66581 (or 66579 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 1066643420 is about 32659.5073447228. The cubic root of 1066643420 is about 1021.7384872458.

The spelling of 1066643420 in words is "one billion, sixty-six million, six hundred forty-three thousand, four hundred twenty".