216664354312401 has 4 divisors (see below), whose sum is σ = 288885805749872. Its totient is φ = 144442902874932.

The previous prime is 216664354312391. The next prime is 216664354312453. The reversal of 216664354312401 is 104213453466612.

216664354312401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216664354312401 - 2¹⁷ = 216664354181329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216664354322401) 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, 36110725718731 + ... + 36110725718736.

It is an arithmetic number, because the mean of its divisors is an integer number (72221451437468).

Almost surely, 2^{216664354312401} is an apocalyptic number.

It is an amenable number.

216664354312401 is a deficient number, since it is larger than the sum of its proper divisors (72221451437471).

216664354312401 is an equidigital number, since it uses as much as digits as its factorization.

216664354312401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72221451437470.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 216664354312401 in words is "two hundred sixteen trillion, six hundred sixty-four billion, three hundred fifty-four million, three hundred twelve thousand, four hundred one".