166801538 has 8 divisors (see below), whose sum is σ = 250713360. Its totient is φ = 83230420.

The previous prime is 166801519. The next prime is 166801549. The reversal of 166801538 is 835108661.

It is a happy number.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83948 + ... + 85911.

It is an arithmetic number, because the mean of its divisors is an integer number (31339170).

Almost surely, 2^166801538 is an apocalyptic number.

166801538 is a deficient number, since it is larger than the sum of its proper divisors (83911822).

166801538 is a wasteful number, since it uses less digits than its factorization.

166801538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170352.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 166801538 is about 12915.1669753047. The cubic root of 166801538 is about 550.4696132353.

The spelling of 166801538 in words is "one hundred sixty-six million, eight hundred one thousand, five hundred thirty-eight".