6446239297640 has 256 divisors, whose sum is σ = 15914227230720. Its totient is φ = 2340078059520.

The previous prime is 6446239297639. The next prime is 6446239297651. The reversal of 6446239297640 is 467929326446.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1307285975 + ... + 1307290905.

It is an arithmetic number, because the mean of its divisors is an integer number (62164950120).

Almost surely, 2^{6446239297640} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6446239297640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7957113615360).

6446239297640 is an abundant number, since it is smaller than the sum of its proper divisors (9467987933080).

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

6446239297640 is a wasteful number, since it uses less digits than its factorization.

6446239297640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452 (or 5448 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 62.

The spelling of 6446239297640 in words is "six trillion, four hundred forty-six billion, two hundred thirty-nine million, two hundred ninety-seven thousand, six hundred forty".