1643426003520 has 1120 divisors, whose sum is σ = 6820599430656. Its totient is φ = 367873228800.

The previous prime is 1643426003411. The next prime is 1643426003551. The reversal of 1643426003520 is 253006243461.

1643426003520 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 42 + 600 + 3 + 5 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2486271990 + ... + 2486272650.

Almost surely, 2^{1643426003520} is an apocalyptic number.

1643426003520 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 1643426003520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3410299715328).

1643426003520 is an abundant number, since it is smaller than the sum of its proper divisors (5177173427136).

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

1643426003520 is a wasteful number, since it uses less digits than its factorization.

1643426003520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 942 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 1643426003520 in words is "one trillion, six hundred forty-three billion, four hundred twenty-six million, three thousand, five hundred twenty".