166650061 has 2 divisors, whose sum is σ = 166650062. Its totient is φ = 166650060.

The previous prime is 166650049. The next prime is 166650089. The reversal of 166650061 is 160056661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146264836 + 20385225 = 12094^2 + 4515^2 .

It is a cyclic number.

It is not a de Polignac number, because 166650061 - 2⁷ = 166649933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166650041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83325030 + 83325031.

It is an arithmetic number, because the mean of its divisors is an integer number (83325031).

Almost surely, 2^166650061 is an apocalyptic number.

It is an amenable number.

166650061 is a deficient number, since it is larger than the sum of its proper divisors (1).

166650061 is an equidigital number, since it uses as much as digits as its factorization.

166650061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 166650061 is about 12909.3013366332. The cubic root of 166650061 is about 550.3029306410.

The spelling of 166650061 in words is "one hundred sixty-six million, six hundred fifty thousand, sixty-one".