18446840466997 has 4 divisors (see below), whose sum is σ = 18446870199520. Its totient is φ = 18446810734476.

The previous prime is 18446840466991. The next prime is 18446840467009. The reversal of 18446840466997 is 79966404864481.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18446840466997 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 (18446840466991) 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, 13915347 + ... + 15183232.

It is an arithmetic number, because the mean of its divisors is an integer number (4611717549880).

Almost surely, 2^{18446840466997} is an apocalyptic number.

It is an amenable number.

18446840466997 is a deficient number, since it is larger than the sum of its proper divisors (29732523).

18446840466997 is an equidigital number, since it uses as much as digits as its factorization.

18446840466997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29732522.

The product of its (nonzero) digits is 2006581248, while the sum is 76.

The spelling of 18446840466997 in words is "eighteen trillion, four hundred forty-six billion, eight hundred forty million, four hundred sixty-six thousand, nine hundred ninety-seven".