2166571556122 has 4 divisors (see below), whose sum is σ = 3249857334186. Its totient is φ = 1083285778060.

The previous prime is 2166571556113. The next prime is 2166571556213. The reversal of 2166571556122 is 2216551756612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1250418204841 + 916153351281 = 1118221^2 + 957159^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541642889029 + ... + 541642889032.

Almost surely, 2^{2166571556122} is an apocalyptic number.

2166571556122 is a deficient number, since it is larger than the sum of its proper divisors (1083285778064).

2166571556122 is a wasteful number, since it uses less digits than its factorization.

2166571556122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083285778063.

The product of its digits is 1512000, while the sum is 49.

The spelling of 2166571556122 in words is "two trillion, one hundred sixty-six billion, five hundred seventy-one million, five hundred fifty-six thousand, one hundred twenty-two".