2161166305252 has 12 divisors (see below), whose sum is σ = 3784055986620. Its totient is φ = 1080007451936.

The previous prime is 2161166305241. The next prime is 2161166305267. The reversal of 2161166305252 is 2525036611612.

It can be written as a sum of positive squares in 2 ways, for example, as 1525086683136 + 636079622116 = 1234944^2 + 797546^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143916727 + ... + 143931742.

It is an arithmetic number, because the mean of its divisors is an integer number (315337998885).

Almost surely, 2^{2161166305252} is an apocalyptic number.

It is an amenable number.

2161166305252 is a deficient number, since it is larger than the sum of its proper divisors (1622889681368).

2161166305252 is a wasteful number, since it uses less digits than its factorization.

2161166305252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287850350 (or 287850348 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 2161166305252 in words is "two trillion, one hundred sixty-one billion, one hundred sixty-six million, three hundred five thousand, two hundred fifty-two".