2158071687 has 16 divisors (see below), whose sum is σ = 3197901280. Its totient is φ = 1438373376.

The previous prime is 2158071667. The next prime is 2158071691. The reversal of 2158071687 is 7861708512.

It is a happy number.

2158071687 is a `hidden beast` number, since 2 + 1 + 580 + 7 + 1 + 68 + 7 = 666.

It is not a de Polignac number, because 2158071687 - 2⁸ = 2158071431 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 (2158071637) 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 15 ways as a sum of consecutive naturals, for example, 164793 + ... + 177405.

It is an arithmetic number, because the mean of its divisors is an integer number (199868830).

Almost surely, 2^2158071687 is an apocalyptic number.

2158071687 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2158071687 is a deficient number, since it is larger than the sum of its proper divisors (1039829593).

2158071687 is a wasteful number, since it uses less digits than its factorization.

2158071687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18959 (or 18953 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The square root of 2158071687 is about 46455.0501775641. The cubic root of 2158071687 is about 1292.2760305650.

The spelling of 2158071687 in words is "two billion, one hundred fifty-eight million, seventy-one thousand, six hundred eighty-seven".