164391787009 has 4 divisors (see below), whose sum is σ = 164879596804. Its totient is φ = 163903977216.

The previous prime is 164391787003. The next prime is 164391787033. The reversal of 164391787009 is 900787193461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900787193461 = 18959 ⋅47512379.

It can be written as a sum of positive squares in 2 ways, for example, as 26821267984 + 137570519025 = 163772^2 + 370905^2 .

It is a cyclic number.

It is not a de Polignac number, because 164391787009 - 2²¹ = 164389689857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164391787003) 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, 243904392 + ... + 243905065.

It is an arithmetic number, because the mean of its divisors is an integer number (41219899201).

Almost surely, 2^164391787009 is an apocalyptic number.

It is an amenable number.

164391787009 is a deficient number, since it is larger than the sum of its proper divisors (487809795).

164391787009 is an equidigital number, since it uses as much as digits as its factorization.

164391787009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487809794.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 164391787009 in words is "one hundred sixty-four billion, three hundred ninety-one million, seven hundred eighty-seven thousand, nine".