166679651 has 4 divisors (see below), whose sum is σ = 168789600. Its totient is φ = 164569704.

The previous prime is 166679641. The next prime is 166679657. The reversal of 166679651 is 156976661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156976661 = 163 ⋅963047.

It is a cyclic number.

It is not a de Polignac number, because 166679651 - 2¹⁰ = 166678627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166679596 and 166679605.

It is not an unprimeable number, because it can be changed into a prime (166679657) 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, 1054856 + ... + 1055013.

It is an arithmetic number, because the mean of its divisors is an integer number (42197400).

Almost surely, 2^166679651 is an apocalyptic number.

166679651 is a deficient number, since it is larger than the sum of its proper divisors (2109949).

166679651 is an equidigital number, since it uses as much as digits as its factorization.

166679651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109948.

The product of its digits is 408240, while the sum is 47.

The square root of 166679651 is about 12910.4473586317. The cubic root of 166679651 is about 550.3354988860.

The spelling of 166679651 in words is "one hundred sixty-six million, six hundred seventy-nine thousand, six hundred fifty-one".