1066661243 has 8 divisors (see below), whose sum is σ = 1133401968. Its totient is φ = 1000364544.

The previous prime is 1066661227. The next prime is 1066661249. The reversal of 1066661243 is 3421666601.

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

It is a cyclic number.

It is not a de Polignac number, because 1066661243 - 2⁴ = 1066661227 is a prime.

It is a super-3 number, since 3×1066661243³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1066661249) 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, 106046 + ... + 115667.

It is an arithmetic number, because the mean of its divisors is an integer number (141675246).

Almost surely, 2^1066661243 is an apocalyptic number.

1066661243 is a deficient number, since it is larger than the sum of its proper divisors (66740725).

1066661243 is a wasteful number, since it uses less digits than its factorization.

1066661243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222013.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 1066661243 is about 32659.7802044043. The cubic root of 1066661243 is about 1021.7441781023.

The spelling of 1066661243 in words is "one billion, sixty-six million, six hundred sixty-one thousand, two hundred forty-three".