2165389425 has 18 divisors (see below), whose sum is σ = 3878453462. Its totient is φ = 1154874240.

The previous prime is 2165389423. The next prime is 2165389439. The reversal of 2165389425 is 5249835612.

2165389425 is a `hidden beast` number, since 2 + 1 + 6 + 538 + 94 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 586995984 + 1578393441 = 24228^2 + 39729^2 .

It is not a de Polignac number, because 2165389425 - 2¹ = 2165389423 is a prime.

It is a super-2 number, since 2×2165389425² = 9377822723803661250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165389423) 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 17 ways as a sum of consecutive naturals, for example, 4811752 + ... + 4812201.

Almost surely, 2^2165389425 is an apocalyptic number.

2165389425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2165389425 is a deficient number, since it is larger than the sum of its proper divisors (1713064037).

2165389425 is a wasteful number, since it uses less digits than its factorization.

2165389425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623969 (or 9623961 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 2165389425 is about 46533.7450136995. The cubic root of 2165389425 is about 1293.7350288823.

The spelling of 2165389425 in words is "two billion, one hundred sixty-five million, three hundred eighty-nine thousand, four hundred twenty-five".