2116155780 has 168 divisors, whose sum is σ = 7014436800. Its totient is φ = 534537792.

The previous prime is 2116155731. The next prime is 2116155787. The reversal of 2116155780 is 875516112.

2116155780 is a `hidden beast` number, since 21 + 1 + 6 + 1 + 557 + 80 = 666.

2116155780 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (2116155787) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 273201 + ... + 280839.

It is an arithmetic number, because the mean of its divisors is an integer number (41752600).

Almost surely, 2^2116155780 is an apocalyptic number.

2116155780 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 2116155780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3507218400).

2116155780 is an abundant number, since it is smaller than the sum of its proper divisors (4898281020).

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

2116155780 is a wasteful number, since it uses less digits than its factorization.

2116155780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7685 (or 7668 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 2116155780 is about 46001.6932297062. The cubic root of 2116155780 is about 1283.8547088637.

The spelling of 2116155780 in words is "two billion, one hundred sixteen million, one hundred fifty-five thousand, seven hundred eighty".