1066643042 has 4 divisors (see below), whose sum is σ = 1599964566. Its totient is φ = 533321520.

The previous prime is 1066643041. The next prime is 1066643063. The reversal of 1066643042 is 2403466601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2403466601 = 181 ⋅13278821.

It can be written as a sum of positive squares in only one way, i.e., 1066610281 + 32761 = 32659^2 + 181^2 .

It is a super-2 number, since 2×1066643042² = 2275454758094027528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066643041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 266660759 + ... + 266660762.

Almost surely, 2^1066643042 is an apocalyptic number.

1066643042 is a deficient number, since it is larger than the sum of its proper divisors (533321524).

1066643042 is an equidigital number, since it uses as much as digits as its factorization.

1066643042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533321523.

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

The square root of 1066643042 is about 32659.5015577397. The cubic root of 1066643042 is about 1021.7383665503.

The spelling of 1066643042 in words is "one billion, sixty-six million, six hundred forty-three thousand, forty-two".