664299722016 has 1008 divisors, whose sum is σ = 2439757000800. Its totient is φ = 176924030976.

The previous prime is 664299721999. The next prime is 664299722041. The reversal of 664299722016 is 610227992466.

664299722016 is a `hidden beast` number, since 6 + 6 + 429 + 9 + 7 + 2 + 201 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 1585440655 + ... + 1585441073.

It is an arithmetic number, because the mean of its divisors is an integer number (2420393850).

Almost surely, 2^664299722016 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 664299722016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1219878500400).

664299722016 is an abundant number, since it is smaller than the sum of its proper divisors (1775457278784).

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

664299722016 is a wasteful number, since it uses less digits than its factorization.

664299722016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 664299722016 in words is "six hundred sixty-four billion, two hundred ninety-nine million, seven hundred twenty-two thousand, sixteen".