164321566 has 4 divisors (see below), whose sum is σ = 246482352. Its totient is φ = 82160782.

The previous prime is 164321543. The next prime is 164321567. The reversal of 164321566 is 665123461.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164321567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41080390 + ... + 41080393.

It is an arithmetic number, because the mean of its divisors is an integer number (61620588).

Almost surely, 2^164321566 is an apocalyptic number.

164321566 is a deficient number, since it is larger than the sum of its proper divisors (82160786).

164321566 is an equidigital number, since it uses as much as digits as its factorization.

164321566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82160785.

The product of its digits is 25920, while the sum is 34.

The square root of 164321566 is about 12818.7973694883. The cubic root of 164321566 is about 547.7278893960.

The spelling of 164321566 in words is "one hundred sixty-four million, three hundred twenty-one thousand, five hundred sixty-six".