166685402 has 8 divisors (see below), whose sum is σ = 269261076. Its totient is φ = 76931712.

The previous prime is 166685401. The next prime is 166685411. The reversal of 166685402 is 204586661.

It can be written as a sum of positive squares in 2 ways, for example, as 164378041 + 2307361 = 12821^2 + 1519^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (166685401) 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, 3205463 + ... + 3205514.

Almost surely, 2^166685402 is an apocalyptic number.

166685402 is a deficient number, since it is larger than the sum of its proper divisors (102575674).

166685402 is a wasteful number, since it uses less digits than its factorization.

166685402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410992.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 166685402 is about 12910.6700833071. The cubic root of 166685402 is about 550.3418282790.

The spelling of 166685402 in words is "one hundred sixty-six million, six hundred eighty-five thousand, four hundred two".