642572218931456 has 144 divisors (see below), whose sum is σ = 1403628400677888. Its totient is φ = 291161930188800.

The previous prime is 642572218931431. The next prime is 642572218931473. The reversal of 642572218931456 is 654139812275246.

It is a junction number, because it is equal to n+sod(n) for n = 642572218931392 and 642572218931401.

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, 9103746341 + ... + 9103816923.

It is an arithmetic number, because the mean of its divisors is an integer number (9747419449152).

Almost surely, 2^{642572218931456} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642572218931456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701814200338944).

642572218931456 is an abundant number, since it is smaller than the sum of its proper divisors (761056181746432).

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

642572218931456 is a wasteful number, since it uses less digits than its factorization.

642572218931456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80708 (or 80694 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 65.

The spelling of 642572218931456 in words is "six hundred forty-two trillion, five hundred seventy-two billion, two hundred eighteen million, nine hundred thirty-one thousand, four hundred fifty-six".