642448025536 has 28 divisors (see below), whose sum is σ = 1315982249920. Its totient is φ = 310861946880.

The previous prime is 642448025533. The next prime is 642448025623. The reversal of 642448025536 is 635520844246.

It is a self number, because there is not a number n which added to its sum of digits gives 642448025536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642448025533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161905281 + ... + 161909248.

Almost surely, 2^642448025536 is an apocalyptic number.

It is an amenable number.

642448025536 is an abundant number, since it is smaller than the sum of its proper divisors (673534224384).

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

642448025536 is a wasteful number, since it uses less digits than its factorization.

642448025536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323814572 (or 323814562 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 49.

The spelling of 642448025536 in words is "six hundred forty-two billion, four hundred forty-eight million, twenty-five thousand, five hundred thirty-six".