664626354344 has 8 divisors (see below), whose sum is σ = 1246174414410. Its totient is φ = 332313177168.

The previous prime is 664626354307. The next prime is 664626354373. The reversal of 664626354344 is 443453626466.

664626354344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 520507417444 + 144118936900 = 721462^2 + 379630^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41539147139 + ... + 41539147154.

Almost surely, 2^664626354344 is an apocalyptic number.

It is an amenable number.

664626354344 is a deficient number, since it is larger than the sum of its proper divisors (581548060066).

664626354344 is a wasteful number, since it uses less digits than its factorization.

664626354344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83078294299 (or 83078294295 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 53.

The spelling of 664626354344 in words is "six hundred sixty-four billion, six hundred twenty-six million, three hundred fifty-four thousand, three hundred forty-four".