166222061 has 4 divisors (see below), whose sum is σ = 166275072. Its totient is φ = 166169052.

The previous prime is 166222037. The next prime is 166222079. The reversal of 166222061 is 160222661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166222061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166222061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166222261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21485 + ... + 28178.

It is an arithmetic number, because the mean of its divisors is an integer number (41568768).

Almost surely, 2^166222061 is an apocalyptic number.

It is an amenable number.

166222061 is a deficient number, since it is larger than the sum of its proper divisors (53011).

166222061 is an equidigital number, since it uses as much as digits as its factorization.

166222061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53010.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 166222061 is about 12892.7134847556. The cubic root of 166222061 is about 549.8314205106.

The spelling of 166222061 in words is "one hundred sixty-six million, two hundred twenty-two thousand, sixty-one".