999805066 has 8 divisors (see below), whose sum is σ = 1615069764. Its totient is φ = 461448480.

The previous prime is 999805063. The next prime is 999805123. The reversal of 999805066 is 660508999.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 943779841 + 56025225 = 30721^2 + 7485^2 .

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

It is a super-2 number, since 2×999805066² = 1999220339998528712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (999805063) 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, 19226995 + ... + 19227046.

Almost surely, 2^999805066 is an apocalyptic number.

999805066 is a deficient number, since it is larger than the sum of its proper divisors (615264698).

999805066 is a wasteful number, since it uses less digits than its factorization.

999805066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38454056.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 999805066 is about 31619.6942742968. The cubic root of 999805066 is about 999.9350177774.

The spelling of 999805066 in words is "nine hundred ninety-nine million, eight hundred five thousand, sixty-six".