664841378258 has 8 divisors (see below), whose sum is σ = 997268159628. Its totient is φ = 332418658384.

The previous prime is 664841378197. The next prime is 664841378261. The reversal of 664841378258 is 852873148466.

664841378258 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 2 ways, for example, as 589942277929 + 74899100329 = 768077^2 + 273677^2 .

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

It is a super-2 number, since 2×664841378258² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664841378258.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566441 + ... + 1284732.

Almost surely, 2^664841378258 is an apocalyptic number.

664841378258 is a deficient number, since it is larger than the sum of its proper divisors (332426781370).

664841378258 is a wasteful number, since it uses less digits than its factorization.

664841378258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030748.

The product of its digits is 61931520, while the sum is 62.

The spelling of 664841378258 in words is "six hundred sixty-four billion, eight hundred forty-one million, three hundred seventy-eight thousand, two hundred fifty-eight".