166372421 has 8 divisors (see below), whose sum is σ = 178282944. Its totient is φ = 154697920.

The previous prime is 166372403. The next prime is 166372463. The reversal of 166372421 is 124273661.

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 166372421 - 2¹⁴ = 166356037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166372471) by changing a digit.

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, 57545 + ... + 60366.

It is an arithmetic number, because the mean of its divisors is an integer number (22285368).

Almost surely, 2^166372421 is an apocalyptic number.

It is an amenable number.

166372421 is a deficient number, since it is larger than the sum of its proper divisors (11910523).

166372421 is a wasteful number, since it uses less digits than its factorization.

166372421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118011.

The product of its digits is 12096, while the sum is 32.

The square root of 166372421 is about 12898.5433673729. The cubic root of 166372421 is about 549.9971581120.

The spelling of 166372421 in words is "one hundred sixty-six million, three hundred seventy-two thousand, four hundred twenty-one".