642218444476 has 24 divisors (see below), whose sum is σ = 1292128137216. Its totient is φ = 273588351600.

The previous prime is 642218444437. The next prime is 642218444477. The reversal of 642218444476 is 674444812246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642218444477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68667100 + ... + 68676451.

It is an arithmetic number, because the mean of its divisors is an integer number (53838672384).

Almost surely, 2^642218444476 is an apocalyptic number.

It is an amenable number.

642218444476 is an abundant number, since it is smaller than the sum of its proper divisors (649909692740).

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

642218444476 is a wasteful number, since it uses less digits than its factorization.

642218444476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137343729 (or 137343727 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 52.

The spelling of 642218444476 in words is "six hundred forty-two billion, two hundred eighteen million, four hundred forty-four thousand, four hundred seventy-six".