166649729 has 8 divisors (see below), whose sum is σ = 169163112. Its totient is φ = 164142720.

The previous prime is 166649723. The next prime is 166649737. The reversal of 166649729 is 927946661.

It can be written as a sum of positive squares in 4 ways, for example, as 80066704 + 86583025 = 8948^2 + 9305^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166649729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166649723) 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 7 ways as a sum of consecutive naturals, for example, 85247 + ... + 87179.

It is an arithmetic number, because the mean of its divisors is an integer number (21145389).

Almost surely, 2^166649729 is an apocalyptic number.

It is an amenable number.

166649729 is a deficient number, since it is larger than the sum of its proper divisors (2513383).

166649729 is a wasteful number, since it uses less digits than its factorization.

166649729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187.

The product of its digits is 979776, while the sum is 50.

The square root of 166649729 is about 12909.2884776815. The cubic root of 166649729 is about 550.3025652032.

The spelling of 166649729 in words is "one hundred sixty-six million, six hundred forty-nine thousand, seven hundred twenty-nine".