1223921664000 has 2560 divisors, whose sum is σ = 5700274145280. Its totient is φ = 254803968000.

The previous prime is 1223921663999. The next prime is 1223921664011. The reversal of 1223921664000 is 4661293221.

It is a happy number.

1223921664000 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 9 + 2 + 1 + 6 + 640 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2560).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 39481343985 + ... + 39481344015.

It is an arithmetic number, because the mean of its divisors is an integer number (2226669588).

Almost surely, 2^{1223921664000} is an apocalyptic number.

1223921664000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223921664000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2850137072640).

1223921664000 is an abundant number, since it is smaller than the sum of its proper divisors (4476352481280).

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

1223921664000 is an frugal number, since it uses more digits than its factorization.

1223921664000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 65 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 1223921664000 in words is "one trillion, two hundred twenty-three billion, nine hundred twenty-one million, six hundred sixty-four thousand".