1663701252840 has 320 divisors, whose sum is σ = 6365468799360. Its totient is φ = 385785607680.

The previous prime is 1663701252803. The next prime is 1663701252841. The reversal of 1663701252840 is 482521073661.

1663701252840 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 70 + 12 + 528 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1663701252841) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 195079 + ... + 1834518.

It is an arithmetic number, because the mean of its divisors is an integer number (19892089998).

Almost surely, 2^{1663701252840} is an apocalyptic number.

1663701252840 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 1663701252840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3182734399680).

1663701252840 is an abundant number, since it is smaller than the sum of its proper divisors (4701767546520).

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

1663701252840 is a wasteful number, since it uses less digits than its factorization.

1663701252840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029654 (or 2029641 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 1663701252840 in words is "one trillion, six hundred sixty-three billion, seven hundred one million, two hundred fifty-two thousand, eight hundred forty".