166421854 has 8 divisors (see below), whose sum is σ = 251923320. Its totient is φ = 82447416.

The previous prime is 166421851. The next prime is 166421861. The reversal of 166421854 is 458124661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166421851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381484 + ... + 381919.

It is an arithmetic number, because the mean of its divisors is an integer number (31490415).

Almost surely, 2^166421854 is an apocalyptic number.

166421854 is a deficient number, since it is larger than the sum of its proper divisors (85501466).

166421854 is a wasteful number, since it uses less digits than its factorization.

166421854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763514.

The product of its digits is 46080, while the sum is 37.

The square root of 166421854 is about 12900.4594491824. The cubic root of 166421854 is about 550.0516249062.

It can be divided in two parts, 16642 and 1854, that added together give a square (18496 = 136²).

The spelling of 166421854 in words is "one hundred sixty-six million, four hundred twenty-one thousand, eight hundred fifty-four".