663738637122 has 250 divisors, whose sum is σ = 1710345250515. Its totient is φ = 192388010760.

The previous prime is 663738637049. The next prime is 663738637153. The reversal of 663738637122 is 221736837366.

It can be written as a sum of positive squares in only one way, i.e., 331869318561 + 331869318561 = 576081^2 + 576081^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576081.

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 124 ways as a sum of consecutive naturals, for example, 28858201603 + ... + 28858201625.

Almost surely, 2^663738637122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663738637122

663738637122 is an abundant number, since it is smaller than the sum of its proper divisors (1046606613393).

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

663738637122 is an frugal number, since it uses more digits than its factorization.

663738637122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 39 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 54.

The spelling of 663738637122 in words is "six hundred sixty-three billion, seven hundred thirty-eight million, six hundred thirty-seven thousand, one hundred twenty-two".