166419538 has 4 divisors (see below), whose sum is σ = 249629310. Its totient is φ = 83209768.

The previous prime is 166419457. The next prime is 166419541. The reversal of 166419538 is 835914661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 149255089 + 17164449 = 12217^2 + 4143^2 .

It is a junction number, because it is equal to n+sod(n) for n = 166419494 and 166419503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41604883 + ... + 41604886.

Almost surely, 2^166419538 is an apocalyptic number.

166419538 is a deficient number, since it is larger than the sum of its proper divisors (83209772).

166419538 is an equidigital number, since it uses as much as digits as its factorization.

166419538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83209771.

The product of its digits is 155520, while the sum is 43.

The square root of 166419538 is about 12900.3696846253. The cubic root of 166419538 is about 550.0490733073.

The spelling of 166419538 in words is "one hundred sixty-six million, four hundred nineteen thousand, five hundred thirty-eight".