442445864721 has 32 divisors (see below), whose sum is σ = 740543600640. Its totient is φ = 229105666944.

The previous prime is 442445864677. The next prime is 442445864737. The reversal of 442445864721 is 127468544244.

It is a happy number.

It is not a de Polignac number, because 442445864721 - 2¹³ = 442445856529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (442445864821) 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, 24097060 + ... + 24115413.

It is an arithmetic number, because the mean of its divisors is an integer number (23141987520).

Almost surely, 2^442445864721 is an apocalyptic number.

It is an amenable number.

442445864721 is a deficient number, since it is larger than the sum of its proper divisors (298097735919).

442445864721 is a wasteful number, since it uses less digits than its factorization.

442445864721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48212525.

The product of its digits is 6881280, while the sum is 51.

The spelling of 442445864721 in words is "four hundred forty-two billion, four hundred forty-five million, eight hundred sixty-four thousand, seven hundred twenty-one".