164243661 has 16 divisors (see below), whose sum is σ = 226281600. Its totient is φ = 105909440.

The previous prime is 164243633. The next prime is 164243689. The reversal of 164243661 is 166342461.

It is an interprime number because it is at equal distance from previous prime (164243633) and next prime (164243689).

It is a cyclic number.

It is not a de Polignac number, because 164243661 - 2¹³ = 164235469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164247661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4015 + ... + 18563.

It is an arithmetic number, because the mean of its divisors is an integer number (14142600).

Almost surely, 2^164243661 is an apocalyptic number.

It is an amenable number.

164243661 is a deficient number, since it is larger than the sum of its proper divisors (62037939).

164243661 is a wasteful number, since it uses less digits than its factorization.

164243661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14676.

The product of its digits is 20736, while the sum is 33.

The square root of 164243661 is about 12815.7583076461. The cubic root of 164243661 is about 547.6413162872.

The spelling of 164243661 in words is "one hundred sixty-four million, two hundred forty-three thousand, six hundred sixty-one".