1799218165 has 8 divisors (see below), whose sum is σ = 2171542968. Its totient is φ = 1431053760.

The previous prime is 1799218147. The next prime is 1799218181. The reversal of 1799218165 is 5618129971.

It can be written as a sum of positive squares in 4 ways, for example, as 436057924 + 1363160241 = 20882^2 + 36921^2 .

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

It is not a de Polignac number, because 1799218165 - 2¹⁹ = 1798693877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1039146 + ... + 1040875.

It is an arithmetic number, because the mean of its divisors is an integer number (271442871).

Almost surely, 2^1799218165 is an apocalyptic number.

It is an amenable number.

1799218165 is a deficient number, since it is larger than the sum of its proper divisors (372324803).

1799218165 is a wasteful number, since it uses less digits than its factorization.

1799218165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080199.

The product of its digits is 272160, while the sum is 49.

The square root of 1799218165 is about 42417.1918566046. The cubic root of 1799218165 is about 1216.2642521868.

The spelling of 1799218165 in words is "one billion, seven hundred ninety-nine million, two hundred eighteen thousand, one hundred sixty-five".