166334381 has 2 divisors, whose sum is σ = 166334382. Its totient is φ = 166334380.

The previous prime is 166334359. The next prime is 166334411. The reversal of 166334381 is 183433661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118156900 + 48177481 = 10870^2 + 6941^2 .

It is an emirp because it is prime and its reverse (183433661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166334381 - 2⁶ = 166334317 is a prime.

It is a super-2 number, since 2×166334381² = 55334252605306322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166334881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83167190 + 83167191.

It is an arithmetic number, because the mean of its divisors is an integer number (83167191).

Almost surely, 2^166334381 is an apocalyptic number.

It is an amenable number.

166334381 is a deficient number, since it is larger than the sum of its proper divisors (1).

166334381 is an equidigital number, since it uses as much as digits as its factorization.

166334381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 166334381 is about 12897.0686979639. The cubic root of 166334381 is about 549.9552371283.

The spelling of 166334381 in words is "one hundred sixty-six million, three hundred thirty-four thousand, three hundred eighty-one".