166001001 has 8 divisors (see below), whose sum is σ = 228474624. Its totient is φ = 107097360.

The previous prime is 166000987. The next prime is 166001021. The reversal of 166001001 is 100100661.

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

It is not a de Polignac number, because 166001001 - 2⁵ = 166000969 is a prime.

166001001 is a modest number, since divided by 1001 gives 166 as remainder.

It is not an unprimeable number, because it can be changed into a prime (166001021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 892386 + ... + 892571.

It is an arithmetic number, because the mean of its divisors is an integer number (28559328).

Almost surely, 2^166001001 is an apocalyptic number.

It is an amenable number.

166001001 is a deficient number, since it is larger than the sum of its proper divisors (62473623).

166001001 is a wasteful number, since it uses less digits than its factorization.

166001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784991.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 166001001 is about 12884.1375730004. The cubic root of 166001001 is about 549.5875706981.

Adding to 166001001 its reverse (100100661), we get a palindrome (266101662).

The spelling of 166001001 in words is "one hundred sixty-six million, one thousand, one".