166678349 has 2 divisors, whose sum is σ = 166678350. Its totient is φ = 166678348.

The previous prime is 166678333. The next prime is 166678367. The reversal of 166678349 is 943876661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166229449 + 448900 = 12893^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 166678349 - 2⁴ = 166678333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166678297 and 166678306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166678249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83339174 + 83339175.

It is an arithmetic number, because the mean of its divisors is an integer number (83339175).

Almost surely, 2^166678349 is an apocalyptic number.

It is an amenable number.

166678349 is a deficient number, since it is larger than the sum of its proper divisors (1).

166678349 is an equidigital number, since it uses as much as digits as its factorization.

166678349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 166678349 is about 12910.3969342542. The cubic root of 166678349 is about 550.3340659203.

The spelling of 166678349 in words is "one hundred sixty-six million, six hundred seventy-eight thousand, three hundred forty-nine".