166698538 has 8 divisors (see below), whose sum is σ = 256146660. Its totient is φ = 81316320.

The previous prime is 166698529. The next prime is 166698547. The reversal of 166698538 is 835896661.

It is an interprime number because it is at equal distance from previous prime (166698529) and next prime (166698547).

It can be written as a sum of positive squares in 2 ways, for example, as 127848249 + 38850289 = 11307^2 + 6233^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1016373 + ... + 1016536.

Almost surely, 2^166698538 is an apocalyptic number.

166698538 is a deficient number, since it is larger than the sum of its proper divisors (89448122).

166698538 is a wasteful number, since it uses less digits than its factorization.

166698538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032952.

The product of its digits is 1866240, while the sum is 52.

The square root of 166698538 is about 12911.1787997843. The cubic root of 166698538 is about 550.3562848546.

The spelling of 166698538 in words is "one hundred sixty-six million, six hundred ninety-eight thousand, five hundred thirty-eight".