664466012721340 has 96 divisors (see below), whose sum is σ = 1455571655774208. Its totient is φ = 254515046400000.

The previous prime is 664466012721257. The next prime is 664466012721359. The reversal of 664466012721340 is 43127210664466.

It is a congruent number.

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, 10252015 + ... + 37868665.

It is an arithmetic number, because the mean of its divisors is an integer number (15162204747648).

Almost surely, 2^{664466012721340} 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 664466012721340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727785827887104).

664466012721340 is an abundant number, since it is smaller than the sum of its proper divisors (791105643052868).

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

664466012721340 is a wasteful number, since it uses less digits than its factorization.

664466012721340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27617099 (or 27617097 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 52.

The spelling of 664466012721340 in words is "six hundred sixty-four trillion, four hundred sixty-six billion, twelve million, seven hundred twenty-one thousand, three hundred forty".