166220454 has 16 divisors (see below), whose sum is σ = 332577648. Its totient is φ = 55384032.

The previous prime is 166220389. The next prime is 166220477. The reversal of 166220454 is 454022661.

It is a super-2 number, since 2×166220454² = 55258478655932232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17164 + ... + 25040.

It is an arithmetic number, because the mean of its divisors is an integer number (20786103).

Almost surely, 2^166220454 is an apocalyptic number.

166220454 is an abundant number, since it is smaller than the sum of its proper divisors (166357194).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166220454 is a wasteful number, since it uses less digits than its factorization.

166220454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11399.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 166220454 is about 12892.6511625810. The cubic root of 166220454 is about 549.8296486200.

The spelling of 166220454 in words is "one hundred sixty-six million, two hundred twenty thousand, four hundred fifty-four".