2161830465 has 20 divisors (see below), whose sum is σ = 3875282004. Its totient is φ = 1152976032.

The previous prime is 2161830439. The next prime is 2161830479. The reversal of 2161830465 is 5640381612.

It is a happy number.

2161830465 is a `hidden beast` number, since 2 + 1 + 618 + 30 + 4 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 889053489 + 1272776976 = 29817^2 + 35676^2 .

It is not a de Polignac number, because 2161830465 - 2⁹ = 2161829953 is a prime.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 2668522 + ... + 2669331.

Almost surely, 2^2161830465 is an apocalyptic number.

It is an amenable number.

2161830465 is a deficient number, since it is larger than the sum of its proper divisors (1713451539).

2161830465 is an equidigital number, since it uses as much as digits as its factorization.

2161830465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5337870 (or 5337861 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 2161830465 is about 46495.4886521262. The cubic root of 2161830465 is about 1293.0258606700.

The spelling of 2161830465 in words is "two billion, one hundred sixty-one million, eight hundred thirty thousand, four hundred sixty-five".