2156827615 has 4 divisors (see below), whose sum is σ = 2588193144. Its totient is φ = 1725462088.

The previous prime is 2156827613. The next prime is 2156827637. The reversal of 2156827615 is 5167286512.

2156827615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2156827615 - 2¹ = 2156827613 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 (2156827613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215682757 + ... + 215682766.

It is an arithmetic number, because the mean of its divisors is an integer number (647048286).

Almost surely, 2^2156827615 is an apocalyptic number.

2156827615 is a deficient number, since it is larger than the sum of its proper divisors (431365529).

2156827615 is an equidigital number, since it uses as much as digits as its factorization.

2156827615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431365528.

The product of its digits is 201600, while the sum is 43.

The square root of 2156827615 is about 46441.6581852974. The cubic root of 2156827615 is about 1292.0276616988.

The spelling of 2156827615 in words is "two billion, one hundred fifty-six million, eight hundred twenty-seven thousand, six hundred fifteen".