2258731665 has 24 divisors (see below), whose sum is σ = 3918201768. Its totient is φ = 1203713280.

The previous prime is 2258731661. The next prime is 2258731669. The reversal of 2258731665 is 5661378522.

2258731665 is a `hidden beast` number, since 2 + 2 + 587 + 3 + 1 + 6 + 65 = 666.

It is an interprime number because it is at equal distance from previous prime (2258731661) and next prime (2258731669).

It can be written as a sum of positive squares in 4 ways, for example, as 1322922384 + 935809281 = 36372^2 + 30591^2 .

It is not a de Polignac number, because 2258731665 - 2² = 2258731661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2258731665.

It is not an unprimeable number, because it can be changed into a prime (2258731661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40447 + ... + 78443.

It is an arithmetic number, because the mean of its divisors is an integer number (163258407).

Almost surely, 2^2258731665 is an apocalyptic number.

It is an amenable number.

2258731665 is a deficient number, since it is larger than the sum of its proper divisors (1659470103).

2258731665 is a wasteful number, since it uses less digits than its factorization.

2258731665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39329 (or 39326 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 2258731665 is about 47526.1156102621. The cubic root of 2258731665 is about 1312.0635784382.

The spelling of 2258731665 in words is "two billion, two hundred fifty-eight million, seven hundred thirty-one thousand, six hundred sixty-five".