164637813 has 4 divisors (see below), whose sum is σ = 219517088. Its totient is φ = 109758540.

The previous prime is 164637799. The next prime is 164637821. The reversal of 164637813 is 318736461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 164637813 - 2¹² = 164633717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164637113) 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 3 ways as a sum of consecutive naturals, for example, 27439633 + ... + 27439638.

It is an arithmetic number, because the mean of its divisors is an integer number (54879272).

Almost surely, 2^164637813 is an apocalyptic number.

It is an amenable number.

164637813 is a deficient number, since it is larger than the sum of its proper divisors (54879275).

164637813 is an equidigital number, since it uses as much as digits as its factorization.

164637813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54879274.

The product of its digits is 72576, while the sum is 39.

The square root of 164637813 is about 12831.1267237137. The cubic root of 164637813 is about 548.0790429344.

The spelling of 164637813 in words is "one hundred sixty-four million, six hundred thirty-seven thousand, eight hundred thirteen".