18164642413 has 4 divisors (see below), whose sum is σ = 18164997180. Its totient is φ = 18164287648.

The previous prime is 18164642389. The next prime is 18164642423. The reversal of 18164642413 is 31424646181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31424646181 = 29 ⋅1083608489.

It can be written as a sum of positive squares in 2 ways, for example, as 2847609769 + 15317032644 = 53363^2 + 123762^2 .

It is a cyclic number.

It is not a de Polignac number, because 18164642413 - 2⁵ = 18164642381 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 (18164642423) 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, 84298 + ... + 208411.

It is an arithmetic number, because the mean of its divisors is an integer number (4541249295).

Almost surely, 2^18164642413 is an apocalyptic number.

It is an amenable number.

18164642413 is a deficient number, since it is larger than the sum of its proper divisors (354767).

18164642413 is an equidigital number, since it uses as much as digits as its factorization.

18164642413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354766.

The product of its digits is 110592, while the sum is 40.

The spelling of 18164642413 in words is "eighteen billion, one hundred sixty-four million, six hundred forty-two thousand, four hundred thirteen".