166666651 has 8 divisors (see below), whose sum is σ = 177411600. Its totient is φ = 156119040.

The previous prime is 166666649. The next prime is 166666673. The reversal of 166666651 is 156666661.

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

It is a cyclic number.

It is not a de Polignac number, because 166666651 - 2¹ = 166666649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166666598 and 166666607.

It is not an unprimeable number, because it can be changed into a prime (166666631) 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, 47590 + ... + 50971.

It is an arithmetic number, because the mean of its divisors is an integer number (22176450).

Almost surely, 2^166666651 is an apocalyptic number.

166666651 is a deficient number, since it is larger than the sum of its proper divisors (10744949).

166666651 is an equidigital number, since it uses as much as digits as its factorization.

166666651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98669.

The product of its digits is 233280, while the sum is 43.

The square root of 166666651 is about 12909.9438805907. The cubic root of 166666651 is about 550.3211909057.

The spelling of 166666651 in words is "one hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-one".