2156945018 has 16 divisors (see below), whose sum is σ = 3410773920. Its totient is φ = 1020189456.

The previous prime is 2156944981. The next prime is 2156945029. The reversal of 2156945018 is 8105496512.

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, 16196 + ... + 67647.

It is an arithmetic number, because the mean of its divisors is an integer number (213173370).

Almost surely, 2^2156945018 is an apocalyptic number.

2156945018 is a deficient number, since it is larger than the sum of its proper divisors (1253828902).

2156945018 is a wasteful number, since it uses less digits than its factorization.

2156945018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84541.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 2156945018 is about 46442.9221518199. The cubic root of 2156945018 is about 1292.0511043344.

The spelling of 2156945018 in words is "two billion, one hundred fifty-six million, nine hundred forty-five thousand, eighteen".