2156806080 has 336 divisors, whose sum is σ = 8717121504. Its totient is φ = 482549760.

The previous prime is 2156806079. The next prime is 2156806081. The reversal of 2156806080 is 806086512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2156806079) and next prime (2156806081).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156806081) 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 47 ways as a sum of consecutive naturals, for example, 409222 + ... + 414458.

It is an arithmetic number, because the mean of its divisors is an integer number (25943814).

Almost surely, 2^2156806080 is an apocalyptic number.

2156806080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156806080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4358560752).

2156806080 is an abundant number, since it is smaller than the sum of its proper divisors (6560315424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156806080 is a wasteful number, since it uses less digits than its factorization.

2156806080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5284 (or 5271 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 2156806080 is about 46441.4263346853. The cubic root of 2156806080 is about 1292.0233615703.

The spelling of 2156806080 in words is "two billion, one hundred fifty-six million, eight hundred six thousand, eighty".