642781883530 has 16 divisors (see below), whose sum is σ = 1157071209984. Its totient is φ = 257098571280.

The previous prime is 642781883521. The next prime is 642781883567. The reversal of 642781883530 is 35388187246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1581426 + ... + 1945885.

It is an arithmetic number, because the mean of its divisors is an integer number (72316950624).

Almost surely, 2^642781883530 is an apocalyptic number.

642781883530 is a deficient number, since it is larger than the sum of its proper divisors (514289326454).

642781883530 is a wasteful number, since it uses less digits than its factorization.

642781883530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545541.

The product of its (nonzero) digits is 7741440, while the sum is 55.

The spelling of 642781883530 in words is "six hundred forty-two billion, seven hundred eighty-one million, eight hundred eighty-three thousand, five hundred thirty".