166106438 has 4 divisors (see below), whose sum is σ = 249159660. Its totient is φ = 83053218.

The previous prime is 166106411. The next prime is 166106441. The reversal of 166106438 is 834601661.

166106438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834601661 = 997 ⋅837113.

It is a junction number, because it is equal to n+sod(n) for n = 166106398 and 166106407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41526608 + ... + 41526611.

It is an arithmetic number, because the mean of its divisors is an integer number (62289915).

Almost surely, 2^166106438 is an apocalyptic number.

166106438 is a deficient number, since it is larger than the sum of its proper divisors (83053222).

166106438 is an equidigital number, since it uses as much as digits as its factorization.

166106438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83053221.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 166106438 is about 12888.2286602931. The cubic root of 166106438 is about 549.7039045359.

The spelling of 166106438 in words is "one hundred sixty-six million, one hundred six thousand, four hundred thirty-eight".