1663163945604 has 192 divisors, whose sum is σ = 4998891950080. Its totient is φ = 468352523520.

The previous prime is 1663163945581. The next prime is 1663163945683. The reversal of 1663163945604 is 4065493613661.

It is a happy number.

1663163945604 is a `hidden beast` number, since 1 + 6 + 63 + 16 + 3 + 9 + 4 + 560 + 4 = 666.

It is a super-4 number, since 4×1663163945604⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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 63 ways as a sum of consecutive naturals, for example, 85145319 + ... + 85164849.

Almost surely, 2^{1663163945604} is an apocalyptic number.

1663163945604 is a gapful number since it is divisible by the number (14) 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 1663163945604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2499445975040).

1663163945604 is an abundant number, since it is smaller than the sum of its proper divisors (3335728004476).

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

1663163945604 is a wasteful number, since it uses less digits than its factorization.

1663163945604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21167 (or 21159 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 1663163945604 in words is "one trillion, six hundred sixty-three billion, one hundred sixty-three million, nine hundred forty-five thousand, six hundred four".