642585254444 has 96 divisors (see below), whose sum is σ = 1331598441600. Its totient is φ = 265605120000.

The previous prime is 642585254419. The next prime is 642585254449. The reversal of 642585254444 is 444452585246.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (642585254449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116809694 + ... + 116815194.

It is an arithmetic number, because the mean of its divisors is an integer number (13870817100).

Almost surely, 2^642585254444 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 642585254444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665799220800).

642585254444 is an abundant number, since it is smaller than the sum of its proper divisors (689013187156).

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

642585254444 is a wasteful number, since it uses less digits than its factorization.

642585254444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6699 (or 6697 counting only the distinct ones).

The product of its digits is 24576000, while the sum is 53.

The spelling of 642585254444 in words is "six hundred forty-two billion, five hundred eighty-five million, two hundred fifty-four thousand, four hundred forty-four".