642520336446 has 128 divisors (see below), whose sum is σ = 1564036300800. Its totient is φ = 194892207840.

The previous prime is 642520336439. The next prime is 642520336511. The reversal of 642520336446 is 644633025246.

642520336446 is a `hidden beast` number, since 6 + 42 + 5 + 203 + 364 + 46 = 666.

It is a congruent number.

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, 2130195 + ... + 2413041.

It is an arithmetic number, because the mean of its divisors is an integer number (12219033600).

Almost surely, 2^642520336446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642520336446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782018150400).

642520336446 is an abundant number, since it is smaller than the sum of its proper divisors (921515964354).

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

642520336446 is a wasteful number, since it uses less digits than its factorization.

642520336446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282971 (or 282965 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 45.

The spelling of 642520336446 in words is "six hundred forty-two billion, five hundred twenty million, three hundred thirty-six thousand, four hundred forty-six".