664556347392 has 224 divisors, whose sum is σ = 2031949151232. Its totient is φ = 189239721984.

The previous prime is 664556347387. The next prime is 664556347421. The reversal of 664556347392 is 293743655466.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52807533 + ... + 52820115.

It is an arithmetic number, because the mean of its divisors is an integer number (9071201568).

Almost surely, 2^664556347392 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 664556347392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015974575616).

664556347392 is an abundant number, since it is smaller than the sum of its proper divisors (1367392803840).

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

664556347392 is a wasteful number, since it uses less digits than its factorization.

664556347392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12926 (or 12902 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 60.

The spelling of 664556347392 in words is "six hundred sixty-four billion, five hundred fifty-six million, three hundred forty-seven thousand, three hundred ninety-two".