2166155916 has 24 divisors (see below), whose sum is σ = 5274119424. Its totient is φ = 690658320.

The previous prime is 2166155897. The next prime is 2166155923. The reversal of 2166155916 is 6195516612.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3923920 + ... + 3924471.

It is an arithmetic number, because the mean of its divisors is an integer number (219754976).

Almost surely, 2^2166155916 is an apocalyptic number.

It is an amenable number.

2166155916 is an abundant number, since it is smaller than the sum of its proper divisors (3107963508).

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

2166155916 is a wasteful number, since it uses less digits than its factorization.

2166155916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7848421 (or 7848419 counting only the distinct ones).

The product of its digits is 97200, while the sum is 42.

The square root of 2166155916 is about 46541.9801469598. The cubic root of 2166155916 is about 1293.8876602848.

It can be divided in two parts, 21661 and 55916, that added together give a palindrome (77577).

The spelling of 2166155916 in words is "two billion, one hundred sixty-six million, one hundred fifty-five thousand, nine hundred sixteen".