642773816718 has 32 divisors (see below), whose sum is σ = 1402493743872. Its totient is φ = 194769091200.

The previous prime is 642773816681. The next prime is 642773816743. The reversal of 642773816718 is 817618377246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 964438 + ... + 1488518.

It is an arithmetic number, because the mean of its divisors is an integer number (43827929496).

Almost surely, 2^642773816718 is an apocalyptic number.

642773816718 is an abundant number, since it is smaller than the sum of its proper divisors (759719927154).

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

642773816718 is a wasteful number, since it uses less digits than its factorization.

642773816718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542680.

The product of its digits is 18966528, while the sum is 60.

The spelling of 642773816718 in words is "six hundred forty-two billion, seven hundred seventy-three million, eight hundred sixteen thousand, seven hundred eighteen".