642215384854 has 4 divisors (see below), whose sum is σ = 963323077284. Its totient is φ = 321107692426.

The previous prime is 642215384849. The next prime is 642215384893. The reversal of 642215384854 is 458483512246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 160553846212 + ... + 160553846215.

It is an arithmetic number, because the mean of its divisors is an integer number (240830769321).

Almost surely, 2^642215384854 is an apocalyptic number.

642215384854 is a deficient number, since it is larger than the sum of its proper divisors (321107692430).

642215384854 is a wasteful number, since it uses less digits than its factorization.

642215384854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321107692429.

The product of its digits is 7372800, while the sum is 52.

The spelling of 642215384854 in words is "six hundred forty-two billion, two hundred fifteen million, three hundred eighty-four thousand, eight hundred fifty-four".