164540663 has 4 divisors (see below), whose sum is σ = 188046480. Its totient is φ = 141034848.

The previous prime is 164540659. The next prime is 164540669. The reversal of 164540663 is 366045461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164540663 - 2² = 164540659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164540669) 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 3 ways as a sum of consecutive naturals, for example, 11752898 + ... + 11752911.

It is an arithmetic number, because the mean of its divisors is an integer number (47011620).

Almost surely, 2^164540663 is an apocalyptic number.

164540663 is a deficient number, since it is larger than the sum of its proper divisors (23505817).

164540663 is an equidigital number, since it uses as much as digits as its factorization.

164540663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23505816.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 164540663 is about 12827.3404492124. The cubic root of 164540663 is about 547.9712176529.

The spelling of 164540663 in words is "one hundred sixty-four million, five hundred forty thousand, six hundred sixty-three".