166654121 has 4 divisors (see below), whose sum is σ = 167575044. Its totient is φ = 165733200.

The previous prime is 166654091. The next prime is 166654129. The reversal of 166654121 is 121456661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34058896 + 132595225 = 5836^2 + 11515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166654121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166654129) 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, 460190 + ... + 460551.

It is an arithmetic number, because the mean of its divisors is an integer number (41893761).

Almost surely, 2^166654121 is an apocalyptic number.

It is an amenable number.

166654121 is a deficient number, since it is larger than the sum of its proper divisors (920923).

166654121 is an equidigital number, since it uses as much as digits as its factorization.

166654121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920922.

The product of its digits is 8640, while the sum is 32.

The square root of 166654121 is about 12909.4585866333. The cubic root of 166654121 is about 550.3073995097.

The spelling of 166654121 in words is "one hundred sixty-six million, six hundred fifty-four thousand, one hundred twenty-one".