1663271522440 has 384 divisors, whose sum is σ = 4473839018880. Its totient is φ = 553881968640.

The previous prime is 1663271522357. The next prime is 1663271522443. The reversal of 1663271522440 is 442251723661.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (1663271522443) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1121557939 + ... + 1121559421.

It is an arithmetic number, because the mean of its divisors is an integer number (11650622445).

Almost surely, 2^{1663271522440} is an apocalyptic number.

1663271522440 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 1663271522440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236919509440).

1663271522440 is an abundant number, since it is smaller than the sum of its proper divisors (2810567496440).

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

1663271522440 is a wasteful number, since it uses less digits than its factorization.

1663271522440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 1663271522440 in words is "one trillion, six hundred sixty-three billion, two hundred seventy-one million, five hundred twenty-two thousand, four hundred forty".