2158856636 has 24 divisors (see below), whose sum is σ = 3946973184. Its totient is φ = 1031262320.

The previous prime is 2158856587. The next prime is 2158856653. The reversal of 2158856636 is 6366588512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65801 + ... + 92991.

It is an arithmetic number, because the mean of its divisors is an integer number (164457216).

Almost surely, 2^2158856636 is an apocalyptic number.

It is an amenable number.

2158856636 is a deficient number, since it is larger than the sum of its proper divisors (1788116548).

2158856636 is a wasteful number, since it uses less digits than its factorization.

2158856636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28081 (or 28079 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The square root of 2158856636 is about 46463.4978881272. The cubic root of 2158856636 is about 1292.4326901459.

The spelling of 2158856636 in words is "two billion, one hundred fifty-eight million, eight hundred fifty-six thousand, six hundred thirty-six".