642228087951 has 6 divisors (see below), whose sum is σ = 927662793720. Its totient is φ = 428152058628.

The previous prime is 642228087937. The next prime is 642228087983. The reversal of 642228087951 is 159780822246.

It is not a de Polignac number, because 642228087951 - 2¹¹ = 642228085903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642228087551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35679338211 + ... + 35679338228.

It is an arithmetic number, because the mean of its divisors is an integer number (154610465620).

Almost surely, 2^642228087951 is an apocalyptic number.

642228087951 is a deficient number, since it is larger than the sum of its proper divisors (285434705769).

642228087951 is a wasteful number, since it uses less digits than its factorization.

642228087951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71358676445 (or 71358676442 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 642228087951 in words is "six hundred forty-two billion, two hundred twenty-eight million, eighty-seven thousand, nine hundred fifty-one".