164661819 has 16 divisors (see below), whose sum is σ = 251827968. Its totient is φ = 93749472.

The previous prime is 164661811. The next prime is 164661823. The reversal of 164661819 is 918166461.

It is not a de Polignac number, because 164661819 - 2³ = 164661811 is a prime.

It is a super-2 number, since 2×164661819² = 54227029272777522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (164661811) 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, 8337 + ... + 19970.

It is an arithmetic number, because the mean of its divisors is an integer number (15739248).

Almost surely, 2^164661819 is an apocalyptic number.

164661819 is a deficient number, since it is larger than the sum of its proper divisors (87166149).

164661819 is a wasteful number, since it uses less digits than its factorization.

164661819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28594.

The product of its digits is 62208, while the sum is 42.

The square root of 164661819 is about 12832.0621491637. The cubic root of 164661819 is about 548.1056802863.

The spelling of 164661819 in words is "one hundred sixty-four million, six hundred sixty-one thousand, eight hundred nineteen".