664822438842 has 8 divisors (see below), whose sum is σ = 1329644877696. Its totient is φ = 221607479612.

The previous prime is 664822438781. The next prime is 664822438843. The reversal of 664822438842 is 248834228466.

664822438842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

664822438842 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (664822438843) 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, 55401869898 + ... + 55401869909.

It is an arithmetic number, because the mean of its divisors is an integer number (166205609712).

Almost surely, 2^664822438842 is an apocalyptic number.

664822438842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664822438842 is a wasteful number, since it uses less digits than its factorization.

664822438842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110803739812.

The product of its digits is 28311552, while the sum is 57.

The spelling of 664822438842 in words is "six hundred sixty-four billion, eight hundred twenty-two million, four hundred thirty-eight thousand, eight hundred forty-two".