1643303620420 has 72 divisors (see below), whose sum is σ = 4379297469120. Its totient is φ = 512198527680.

The previous prime is 1643303620391. The next prime is 1643303620423. The reversal of 1643303620420 is 240263033461.

It is not an unprimeable number, because it can be changed into a prime (1643303620423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76209240 + ... + 76230799.

It is an arithmetic number, because the mean of its divisors is an integer number (60823575960).

Almost surely, 2^{1643303620420} is an apocalyptic number.

1643303620420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643303620420 is an abundant number, since it is smaller than the sum of its proper divisors (2735993848700).

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

1643303620420 is a wasteful number, since it uses less digits than its factorization.

1643303620420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152440073 (or 152440064 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

Adding to 1643303620420 its reverse (240263033461), we get a palindrome (1883566653881).

The spelling of 1643303620420 in words is "one trillion, six hundred forty-three billion, three hundred three million, six hundred twenty thousand, four hundred twenty".