442272437681 has 2 divisors, whose sum is σ = 442272437682. Its totient is φ = 442272437680.

The previous prime is 442272437671. The next prime is 442272437741. The reversal of 442272437681 is 186734272244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435256867600 + 7015570081 = 659740^2 + 83759^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442272437681 is a prime.

It is a super-2 number, since 2×442272437681² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (442272437671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221136218840 + 221136218841.

It is an arithmetic number, because the mean of its divisors is an integer number (221136218841).

Almost surely, 2^442272437681 is an apocalyptic number.

It is an amenable number.

442272437681 is a deficient number, since it is larger than the sum of its proper divisors (1).

442272437681 is an equidigital number, since it uses as much as digits as its factorization.

442272437681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3612672, while the sum is 50.

The spelling of 442272437681 in words is "four hundred forty-two billion, two hundred seventy-two million, four hundred thirty-seven thousand, six hundred eighty-one".