1066418399 has 4 divisors (see below), whose sum is σ = 1070995536. Its totient is φ = 1061841264.

The previous prime is 1066418387. The next prime is 1066418411. The reversal of 1066418399 is 9938146601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9938146601 = 941 ⋅10561261.

It is an interprime number because it is at equal distance from previous prime (1066418387) and next prime (1066418411).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066418399 is a prime.

It is a super-2 number, since 2×1066418399² = 2274496403451446402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066418369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2288219 + ... + 2288684.

It is an arithmetic number, because the mean of its divisors is an integer number (267748884).

Almost surely, 2^1066418399 is an apocalyptic number.

1066418399 is a deficient number, since it is larger than the sum of its proper divisors (4577137).

1066418399 is an equidigital number, since it uses as much as digits as its factorization.

1066418399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4577136.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 1066418399 is about 32656.0622090294. The cubic root of 1066418399 is about 1021.6666329344. Note that the first 4 decimals are identical.

The spelling of 1066418399 in words is "one billion, sixty-six million, four hundred eighteen thousand, three hundred ninety-nine".