18642046109 has 4 divisors (see below), whose sum is σ = 18765503520. Its totient is φ = 18518588700.

The previous prime is 18642046063. The next prime is 18642046121. The reversal of 18642046109 is 90164024681.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90164024681 = 89 ⋅1013078929.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18642046109 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 (18642046309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61728479 + ... + 61728780.

It is an arithmetic number, because the mean of its divisors is an integer number (4691375880).

Almost surely, 2^18642046109 is an apocalyptic number.

It is an amenable number.

18642046109 is a deficient number, since it is larger than the sum of its proper divisors (123457411).

18642046109 is a wasteful number, since it uses less digits than its factorization.

18642046109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123457410.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 18642046109 in words is "eighteen billion, six hundred forty-two million, forty-six thousand, one hundred nine".