1643016229920 has 576 divisors, whose sum is σ = 6237563552640. Its totient is φ = 401531516928.

The previous prime is 1643016229909. The next prime is 1643016229937. The reversal of 1643016229920 is 299226103461.

1643016229920 is a `hidden beast` number, since 16 + 4 + 3 + 0 + 1 + 622 + 9 + 9 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4576646701 + ... + 4576647059.

It is an arithmetic number, because the mean of its divisors is an integer number (10829103390).

Almost surely, 2^{1643016229920} is an apocalyptic number.

1643016229920 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 1643016229920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3118781776320).

1643016229920 is an abundant number, since it is smaller than the sum of its proper divisors (4594547322720).

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

1643016229920 is a wasteful number, since it uses less digits than its factorization.

1643016229920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 1643016229920 in words is "one trillion, six hundred forty-three billion, sixteen million, two hundred twenty-nine thousand, nine hundred twenty".