442531622642 has 6 divisors (see below), whose sum is σ = 663798845133. Its totient is φ = 221265340932.

The previous prime is 442531622629. The next prime is 442531622671. The reversal of 442531622642 is 246226135244.

It can be written as a sum of positive squares in 2 ways, for example, as 400588992241 + 41942630401 = 632921^2 + 204799^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=470389.

It is a super-2 number, since 2×442531622642² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 442531622642.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 705584 + ... + 1175972.

Almost surely, 2^442531622642 is an apocalyptic number.

442531622642 is a deficient number, since it is larger than the sum of its proper divisors (221267222491).

442531622642 is an frugal number, since it uses more digits than its factorization.

442531622642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940780 (or 470391 counting only the distinct ones).

The product of its digits is 552960, while the sum is 41.

Adding to 442531622642 its reverse (246226135244), we get a palindrome (688757757886).

The spelling of 442531622642 in words is "four hundred forty-two billion, five hundred thirty-one million, six hundred twenty-two thousand, six hundred forty-two".