664614458256 has 160 divisors (see below), whose sum is σ = 2008431293440. Its totient is φ = 185418035712.

The previous prime is 664614458243. The next prime is 664614458269. The reversal of 664614458256 is 652854416466.

It is an interprime number because it is at equal distance from previous prime (664614458243) and next prime (664614458269).

It is a junction number, because it is equal to n+sod(n) for n = 664614458196 and 664614458205.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80370090 + ... + 80378358.

It is an arithmetic number, because the mean of its divisors is an integer number (12552695584).

Almost surely, 2^664614458256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664614458256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1004215646720).

664614458256 is an abundant number, since it is smaller than the sum of its proper divisors (1343816835184).

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

664614458256 is a wasteful number, since it uses less digits than its factorization.

664614458256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13893 (or 13887 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 57.

The spelling of 664614458256 in words is "six hundred sixty-four billion, six hundred fourteen million, four hundred fifty-eight thousand, two hundred fifty-six".