2158665903 has 8 divisors (see below), whose sum is σ = 3198023600. Its totient is φ = 1439110584.

The previous prime is 2158665853. The next prime is 2158665907. The reversal of 2158665903 is 3095668512.

2158665903 is a `hidden beast` number, since 2 + 1 + 58 + 6 + 6 + 590 + 3 = 666.

It is not a de Polignac number, because 2158665903 - 2²¹ = 2156568751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158665907) 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 7 ways as a sum of consecutive naturals, for example, 39975268 + ... + 39975321.

It is an arithmetic number, because the mean of its divisors is an integer number (399752950).

Almost surely, 2^2158665903 is an apocalyptic number.

2158665903 is a deficient number, since it is larger than the sum of its proper divisors (1039357697).

2158665903 is an equidigital number, since it uses as much as digits as its factorization.

2158665903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79950598 (or 79950592 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 2158665903 is about 46461.4453391196. The cubic root of 2158665903 is about 1292.3946272781.

The spelling of 2158665903 in words is "two billion, one hundred fifty-eight million, six hundred sixty-five thousand, nine hundred three".