166101001 has 4 divisors (see below), whose sum is σ = 181201104. Its totient is φ = 151000900.

The previous prime is 166100981. The next prime is 166101031. The reversal of 166101001 is 100101661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166101001 - 2¹⁵ = 166068233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166101031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7550035 + ... + 7550056.

It is an arithmetic number, because the mean of its divisors is an integer number (45300276).

Almost surely, 2^166101001 is an apocalyptic number.

166101001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166101001 is a deficient number, since it is larger than the sum of its proper divisors (15100103).

166101001 is a wasteful number, since it uses less digits than its factorization.

166101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15100102.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 166101001 is about 12888.0177296588. The cubic root of 166101001 is about 549.6979068299.

Adding to 166101001 its reverse (100101661), we get a palindrome (266202662).

The spelling of 166101001 in words is "one hundred sixty-six million, one hundred one thousand, one".