166616221270 has 16 divisors (see below), whose sum is σ = 304017544800. Its totient is φ = 65733522624.

The previous prime is 166616221253. The next prime is 166616221273. The reversal of 166616221270 is 72122616661.

It is a happy number.

166616221270 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166616221273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114119970 + ... + 114121429.

It is an arithmetic number, because the mean of its divisors is an integer number (19001096550).

Almost surely, 2^166616221270 is an apocalyptic number.

166616221270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166616221270 is a deficient number, since it is larger than the sum of its proper divisors (137401323530).

166616221270 is a wasteful number, since it uses less digits than its factorization.

166616221270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228241479.

The product of its (nonzero) digits is 72576, while the sum is 40.

The spelling of 166616221270 in words is "one hundred sixty-six billion, six hundred sixteen million, two hundred twenty-one thousand, two hundred seventy".