2166156393 has 16 divisors (see below), whose sum is σ = 2920215936. Its totient is φ = 1428134400.

The previous prime is 2166156367. The next prime is 2166156397. The reversal of 2166156393 is 3936516612.

It is not a de Polignac number, because 2166156393 - 2⁶ = 2166156329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2166156397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289305 + ... + 296697.

It is an arithmetic number, because the mean of its divisors is an integer number (182513496).

Almost surely, 2^2166156393 is an apocalyptic number.

It is an amenable number.

2166156393 is a deficient number, since it is larger than the sum of its proper divisors (754059543).

2166156393 is a wasteful number, since it uses less digits than its factorization.

2166156393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8464.

The product of its digits is 174960, while the sum is 42.

The square root of 2166156393 is about 46541.9852713655. The cubic root of 2166156393 is about 1293.8877552586.

The spelling of 2166156393 in words is "two billion, one hundred sixty-six million, one hundred fifty-six thousand, three hundred ninety-three".