800561018 has 8 divisors (see below), whose sum is σ = 1201056660. Its totient is φ = 400208800.

The previous prime is 800560987. The next prime is 800561033. The reversal of 800561018 is 810165008.

It can be written as a sum of positive squares in 2 ways, for example, as 729378049 + 71182969 = 27007^2 + 8437^2 .

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

It is a super-4 number, since 4×800561018⁴ (a number of 37 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20603 + ... + 45006.

Almost surely, 2^800561018 is an apocalyptic number.

800561018 is a deficient number, since it is larger than the sum of its proper divisors (400495642).

800561018 is a wasteful number, since it uses less digits than its factorization.

800561018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71712.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 800561018 is about 28294.1870001596. The cubic root of 800561018 is about 928.5347172570.

The spelling of 800561018 in words is "eight hundred million, five hundred sixty-one thousand, eighteen".