1145666999 has 4 divisors (see below), whose sum is σ = 1145807400. Its totient is φ = 1145526600.

The previous prime is 1145666983. The next prime is 1145667023. The reversal of 1145666999 is 9996665411.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1145666999 - 2⁴ = 1145666983 is a prime.

It is a super-3 number, since 3×1145666999³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145666099) 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, 57152 + ... + 74549.

It is an arithmetic number, because the mean of its divisors is an integer number (286451850).

Almost surely, 2^1145666999 is an apocalyptic number.

1145666999 is a deficient number, since it is larger than the sum of its proper divisors (140401).

1145666999 is an equidigital number, since it uses as much as digits as its factorization.

1145666999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140400.

The product of its digits is 3149280, while the sum is 56.

The square root of 1145666999 is about 33847.7030092147. The cubic root of 1145666999 is about 1046.3720594406.

The spelling of 1145666999 in words is "one billion, one hundred forty-five million, six hundred sixty-six thousand, nine hundred ninety-nine".