166048921 has 2 divisors, whose sum is σ = 166048922. Its totient is φ = 166048920.

The previous prime is 166048879. The next prime is 166048969. The reversal of 166048921 is 129840661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95824521 + 70224400 = 9789^2 + 8380^2 .

It is a cyclic number.

It is not a de Polignac number, because 166048921 - 2⁹ = 166048409 is a prime.

It is not a weakly prime, because it can be changed into another prime (166018921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83024460 + 83024461.

It is an arithmetic number, because the mean of its divisors is an integer number (83024461).

Almost surely, 2^166048921 is an apocalyptic number.

It is an amenable number.

166048921 is a deficient number, since it is larger than the sum of its proper divisors (1).

166048921 is an equidigital number, since it uses as much as digits as its factorization.

166048921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 166048921 is about 12885.9970898646. The cubic root of 166048921 is about 549.6404493002.

The spelling of 166048921 in words is "one hundred sixty-six million, forty-eight thousand, nine hundred twenty-one".