643311242442 has 96 divisors (see below), whose sum is σ = 1537778960640. Its totient is φ = 192739920000.

The previous prime is 643311242411. The next prime is 643311242449. The reversal of 643311242442 is 244242113346.

643311242442 is a `hidden beast` number, since 64 + 3 + 3 + 112 + 42 + 442 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 643311242397 and 643311242406.

It is not an unprimeable number, because it can be changed into a prime (643311242449) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14356192 + ... + 14400932.

It is an arithmetic number, because the mean of its divisors is an integer number (16018530840).

Almost surely, 2^643311242442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643311242442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (768889480320).

643311242442 is an abundant number, since it is smaller than the sum of its proper divisors (894467718198).

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

643311242442 is a wasteful number, since it uses less digits than its factorization.

643311242442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45580 (or 45577 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

Adding to 643311242442 its reverse (244242113346), we get a palindrome (887553355788).

The spelling of 643311242442 in words is "six hundred forty-three billion, three hundred eleven million, two hundred forty-two thousand, four hundred forty-two".