166220051 has 8 divisors (see below), whose sum is σ = 171357360. Its totient is φ = 161160192.

The previous prime is 166220023. The next prime is 166220071. The reversal of 166220051 is 150022661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166220051 - 2⁶ = 166219987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166219999 and 166220026.

It is not an unprimeable number, because it can be changed into a prime (166220071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14990 + ... + 23603.

It is an arithmetic number, because the mean of its divisors is an integer number (21419670).

Almost surely, 2^166220051 is an apocalyptic number.

166220051 is a deficient number, since it is larger than the sum of its proper divisors (5137309).

166220051 is an equidigital number, since it uses as much as digits as its factorization.

166220051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38725.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 166220051 is about 12892.6355335129. The cubic root of 166220051 is about 549.8292042673.

The spelling of 166220051 in words is "one hundred sixty-six million, two hundred twenty thousand, fifty-one".