2158691603 has 8 divisors (see below), whose sum is σ = 2359405440. Its totient is φ = 1966170240.

The previous prime is 2158691573. The next prime is 2158691659. The reversal of 2158691603 is 3061968512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2158691603 - 2⁸ = 2158691347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158691503) 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 7 ways as a sum of consecutive naturals, for example, 2047568 + ... + 2048621.

It is an arithmetic number, because the mean of its divisors is an integer number (294925680).

Almost surely, 2^2158691603 is an apocalyptic number.

2158691603 is a deficient number, since it is larger than the sum of its proper divisors (200713837).

2158691603 is a wasteful number, since it uses less digits than its factorization.

2158691603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096237.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 2158691603 is about 46461.7219116985. The cubic root of 2158691603 is about 1292.3997561265.

The spelling of 2158691603 in words is "two billion, one hundred fifty-eight million, six hundred ninety-one thousand, six hundred three".