2198871765 has 28 divisors (see below), whose sum is σ = 3956165964. Its totient is φ = 1172729664.

The previous prime is 2198871761. The next prime is 2198871781. The reversal of 2198871765 is 5671788912.

It can be written as a sum of positive squares in 2 ways, for example, as 932508369 + 1266363396 = 30537^2 + 35586^2 .

It is not a de Polignac number, because 2198871765 - 2² = 2198871761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2198871761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 297984 + ... + 305273.

Almost surely, 2^2198871765 is an apocalyptic number.

It is an amenable number.

2198871765 is a deficient number, since it is larger than the sum of its proper divisors (1757294199).

2198871765 is an frugal number, since it uses more digits than its factorization.

2198871765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603280 (or 603265 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 2198871765 is about 46892.1290303607. The cubic root of 2198871765 is about 1300.3690796238.

The spelling of 2198871765 in words is "two billion, one hundred ninety-eight million, eight hundred seventy-one thousand, seven hundred sixty-five".