642416434278 has 16 divisors (see below), whose sum is σ = 1290164128176. Its totient is φ = 213250268160.

The previous prime is 642416434267. The next prime is 642416434327. The reversal of 642416434278 is 872434614246.

It is a self number, because there is not a number n which added to its sum of digits gives 642416434278.

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 in 7 ways as a sum of consecutive naturals, for example, 222134251 + ... + 222137142.

It is an arithmetic number, because the mean of its divisors is an integer number (80635258011).

Almost surely, 2^642416434278 is an apocalyptic number.

642416434278 is an abundant number, since it is smaller than the sum of its proper divisors (647747693898).

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

642416434278 is a wasteful number, since it uses less digits than its factorization.

642416434278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444271639.

The product of its digits is 6193152, while the sum is 51.

The spelling of 642416434278 in words is "six hundred forty-two billion, four hundred sixteen million, four hundred thirty-four thousand, two hundred seventy-eight".