166651001 has 6 divisors (see below), whose sum is σ = 183178506. Its totient is φ = 151500800.

The previous prime is 166650973. The next prime is 166651003. The reversal of 166651001 is 100156661.

It can be written as a sum of positive squares in only one way, i.e., 146410000 + 20241001 = 12100^2 + 4499^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166651001 is a prime.

It is a super-2 number, since 2×166651001² = 55545112268604002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166651003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 688520 + ... + 688761.

It is an arithmetic number, because the mean of its divisors is an integer number (30529751).

Almost surely, 2^166651001 is an apocalyptic number.

166651001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166651001 is a deficient number, since it is larger than the sum of its proper divisors (16527505).

166651001 is a wasteful number, since it uses less digits than its factorization.

166651001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377303 (or 1377292 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 166651001 is about 12909.3377444391. The cubic root of 166651001 is about 550.3039653116.

The spelling of 166651001 in words is "one hundred sixty-six million, six hundred fifty-one thousand, one".