164166643 has 4 divisors (see below), whose sum is σ = 164202808. Its totient is φ = 164130480.

The previous prime is 164166581. The next prime is 164166659. The reversal of 164166643 is 346661461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346661461 = 227 ⋅1527143.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164166643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164160643) 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, 10098 + ... + 20743.

It is an arithmetic number, because the mean of its divisors is an integer number (41050702).

Almost surely, 2^164166643 is an apocalyptic number.

164166643 is a deficient number, since it is larger than the sum of its proper divisors (36165).

164166643 is an equidigital number, since it uses as much as digits as its factorization.

164166643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36164.

The product of its digits is 62208, while the sum is 37.

The square root of 164166643 is about 12812.7531389628. The cubic root of 164166643 is about 547.5557019563. Note that the first 3 decimals are identical.

The spelling of 164166643 in words is "one hundred sixty-four million, one hundred sixty-six thousand, six hundred forty-three".